The effects of the new ""Winston Seth"" fault line are being felt all around the Pacific Rim as evacuations on ORCA are taking place. Lena locates the final piece of the Synchronium. Mera grows more suspicious of Kal's frequent disappearances but Neri once again defends his behaviour. After Sallyanne confronts Jason, Lena tells him that he should tell Sallyanne about Neri as she is his only close friend who doesn't know. He kids venture inland to recover the Synchronium, UBRI is also searching in the area but it is Neri who recovers the final piece. Neri gives the Synchronium piece to Jason to take to the underwater cave. Kal observes the pair leaving and discovers the location of the cave. He quickly reports back to Dr. Hellegren who, after dismissing Kal's request to have his side of their bargain upheld, sets out to recover the Synchronium. As Kal is bringing the pieces to the surface for Hellegren, Charlie warns Neri about what is going on, but when she gets to the cave, the Synchron

A large quake prompts the commander to call for an evacuation of all ORCA personnel under the age of 18. Dr. Hellegren is putting the Synchronium together when Kal demands that he be made the ruler of Neri's island as he was promised, Hellegren again brushes off Kal and has him escorted back to his room. Anxious to get the Synchronium back from Dr. Hellegren, Neri goes to get Jason. He is out on a dive mission with Sallyanne, and when Neri surfaces Sallyanne is there to see her. Angry about the way he is being treated by Dr. Hellegren, Kal attempts to steal a piece of the Synchronium, he is quickly caught by UBRI guards and taken back to his room. Back on ORCA, Sallyanne is introduced to Neri and Mera and plans are made to recover the Synchronium. Getting away during the confusion surrounding the evacuation, the kids are able to make it to UBRI's pier on the mainland. However, they are soon spotted by Kellar and are left tied (Dr. Hellegren taking Lena with him) up as the UBRI vessel h

Neri has Kal promise not to leave the island again. Lena uses HELEN to locate another piece of the Synchronium. Mera appears to Neri to again warns her that time is running out. The next day, Neri and Kal are on ORCA, but when asked to pinpoint the landing area of the Synchronium, Kal says he cannot. Kal tells Neri he is going back to the island to have a swim and think about problem but he instead goes to see Dr. Hellegren to tell him about the new piece. Hellegren isn't anxious to sent UBRI forces after it, instead preferring to let the kids find it and then take all the pieces at once after Kal discovers where they are hidden. Lena does her best to pinpoint the location of the Synchronium, but must use more of HELEN's resources to do so. Unfortunately an earthquake hits at that moment and the Commander quickly discovers the extra strain on HELEN when he is unable to access HELEN. As punishment for their actions, Lean, Cass, Brett, and Benny are assigned to clean-up detail—with Morga

Dianne demands that a tribunal hearing be convened to stop UBRI's development, but Hellegren argues that there is no connection between the earthquake and UBRI's explosions. Another piece of the Synchronium is located by Lena, and Brett and Cass are sent to Beri's island to get Kal to pinpoint it's location. Venturing inland to retrieve the piece, Neri, Brett and Cass encounter a farm family with a blind daughter (Petra Yared). After discovering the Synchronium capsule to be empty, the trio are surprised to find that the Synchronium piece is a prized possession of Patti. After spending time with Patti, she gives Neri the Synchronium piece. When Lena encounters her father on ORCA, she threatens to go public with his work if he makes life difficult for her on the station. Dianne is upset to discover that canisters of radioactive materials are being stored in the school section of ORCA. When a tremor strikes, the canisters break open threatening Benny who is in the otherwise deserted comp

HELEN is not being cooperative in the kids' search for more pieces of the Synchronium. Meanwhile, UBRI has located another piece. With no where to go after leaving home, Jason and Brett convince their mother into letting Lena stay with them on ORCA. Lena is taken to meet Neri and Kal on their island and after returning to ORCA, she is able to find the location of another piece of Synchronium from HELEN. Unfortunately, when they arrive at the location pinpointed by Kal, they discover that once again, UBRI has beaten them to it. Plans are quickly made to get the two pieces that UBRI has in their possession. Neri want's to go on the raid of UBRI headquarters and Jason, concerned for her safety, begrudgingly agrees to let her come along but then leaves with the others a day early to keep her from coming. Neri comes to ORCA the next day to see how the plans are going and discovers that she's been lied to and she angrily goes back to her island to wait. Entering the UBRI complex, the two pie

A trip to ORCA prompts a discussion between Neri and Kal about feelings. Cass is beginning to remember about her time on Neri's island in her dreams. Brett takes Benny to the island to see Neri and Kal and Jason arrives soon after having discovered the location of another piece of Synchronium deep in the ocean. Neri is anxious to retrieve it and sets out by herself. The boat taking Brett and Benny back to ORCA breaks down, and with strict instructions not to go to ORCA, Kal abandons them in the middle of nowhere. Fortunately, Charlie alerts Neri, who was unsuccessful in her attempt at retrieving the Synchronium, and she comes to their rescue. Back on ORCA Brett is hassled by Moose, a bully who demands his new satellite navigation unit. With Jason and Brett assisting her, Neri retrieves the Synchronium from the ocean depths just moments before UBRI arrives on the scene. Brett is again confronted by Moose but Kal, acting on the lesson he received on loyalty after abandoning Brett and Ben

Jason and Brett round up their friends to help rescue Charlie, but Jason must also tell them the truth about Neri. Dianne destroys all of her research on Neri after Commander Lucas tells her that he will have to file a report on Neri. The kids infiltrate the UBRI command post and are able to release the net and free Charlie. A blood test done on Neri indicates that she is not human. Dianne convinces Commander Lucas not to file his report. Leaving with Charlie on his annual migration, Neri tells her friends to watch for her return.

Neri makes her first visit to ORCA since her return, and tells her friends that she wants to discover who ""her people"" were. Jason, Brett and Neri go to her island to look for clues to her identity. Brett gives Neri the pendant he found in the flower, and Neri tells him it was her fathers and is a map of the island. Following clues found on the island, a large object is discovered under the island–from what they have learned so far, Jason suspects it to be a spacecraft. Mick locks Rocky in the recompression chamber.

Jason takes Neri and Mera swimming off the ORCA platform. Mick finds out and heads out on a jetski, he falls off and must be rescued by the girls. Neri helps Mick with his reading, he in turn joins the others in keeping Neri and Mera a secret. Forsythe tries to get access to Dianne's research and cripples HELEN in the process, in the confusion Lyselle sees Mera in the coridor and reports back to Dr. Hellegren that Neri and Mera are on ORCA. Winston, receiving strange signals from Neri's island, goes to investigate and meets two strangers, but back on ORCA he says his trip was uneventfull.

Brett tries unsuccessfully to get Kal to come out of the spaceship. Dianne is granted a tribunal hearing to voice her concerns about the effects UBRI's construction is having on the fault line. During the hearing a tremor hits causing panic on ORCA and causing Charlie to beach himself. Neri recruits her friends on ORCA to try and rescue him. Jason leaves his post to help out and Sallyanne must cover for him when the Commander asks her where he is. The tribunal allows UBRI to continue their construction, but without blasting. Kal comes to ORCA looking for Brett but ends up talking with Sallyanne since everyone else is helping with Charlie. Needing additional help to free Charlie, Jason recruits Winston who helps place a sling under Charlie so that he can be towed off the sandbar. Returning to the island, Kal asks Neri why he wasn't asked to help with Charlie, unhappy with her answer, he walks away. On a secluded sandbar, Kal is observed and photographed by UBRI.

Neri continues to teach Kal about feelings. Cass is still having her dreams about her time on Neri's island and now remembers Brett being there. Lena overhears her father and Kellar talking about their plans for creating a news bulletin to lure some of the kids from ORCA to an island to find out exactly what they know about the alien device. Jason is uneasy about his helicopter flight test and is unable take the controls. Kal searches the spaceship for a gift left to him by his parents. Benny and Brett arrive and find him playing a strange musical instrument and crying, Brett explains to Kal why people cry. Seeing the news bulletin created by UBRI, Brett and Neri head off to the remote island looking what they believe to be another piece of the Synchronium. Lena arrives on ORCA to warn the Bates brothers about the trap but she is too late to stop Brett, she does find Jason and warn him. Needing to get to Brett and Neri quickly, Jason goes on another helicopter test with Morgan and dive

Hoping to keep Kal from making any return trips to ORCA, Jason suggests to Neri that she show him around the spaceship which he has been interested in. Winston's inability to swim is made an issue of by Kellar and UBRI, threatening his job on ORCA as they hope to replace him with one of their own. Fortunately, Benny discovers a provision is the regulations forcing the commander to give Winston a week to meet the qualifications. Neri brings Jason and Brett back to the ship where she and Kal have made a discovery. An interface with the ship's computer gives Neri access the ship's log written by Kal's mother. She explains to the group about a mission requiring the assembly of nine pieces of ""Synchronium"" which once put together will have the power to heal the Earth's oceans. Neri asks Jason and Brett to help her look for the Synchronium but they must no tell anyone else. Believing that Neri is close by to assist him, Winston passes his swimming test.

Kellar shows Dr. Hellegren the footage she took of Kal on the sandbar, he quickly recognizes who Kal is and wants to capture him. After another of Kal's outbursts at Jason, Neri tells him to change his attitude or leave the island, Kal chooses the latter. A causal remark by Dave Hartley to Dianne has Brett thinking he may be interested in her. Brett recruits Benny to write a love note hoping to get the pair together (for his own selfish reasons mind you). Unfortunately, Jason inadvertently gives the note to Sallyanne who thinks Jason has finally taken notice of her. When he tells her of the mistake, Sallyanne is crushed. Brett tries to end the fiasco by throwing out the note but is is retrieved by Delores, a girl he's been hounded by all day. Kal is caught by Dr. Hellegren and taken back to UBRI headquarters where Hellegren begins the process of convincing Kal to trust him. Worried about what has become of Kal, Neri, Brett and Jason search the island for him.

Neri and Mera make the decision to return to the Ocean Planet and convince Diane that her research must continue. Froggy fixes HELEN, with a little help from Damien. Commander Byrne has Forsythe arrested when HELEN identifies him as the sabateur. The kids take care of Liselle, keeping her from contacting UBRI. Neri and Mera are taken back to the island, with Winston, Mick and Zoe acting as decoys to keep UBRI away. Final goodbyes are said as the girls board the spacecraft for home but after the ship leaves, one person has stayed behind. Neri says she must stay to ""finish father's work.""

Budds The growing frequency of the seismic tremors causes Commander Wellington to call for voluntary evacuations of ORCA personnel. Cass tells Morgan to ""drop dead"" when Morgan gets after Jason for wanting to skip a survey dive. Jason's dive with Morgan ends abruptly when Morgan is stung by a stonefish, requiring her to be rushed back to ORCA. Cass feels guilty for what she said to her sister earlier. Sallyanne tries to talk to Jason about how she feels about him but he dismisses her to join his friends who are preparing to intercept the Synchronium transfer from Mr. Lee to Dr. Hellegren. Brett stows away on the UBRI vessel and when the are out at sea, he disables the craft and steals the Synchronium piece. Brett jumps overboard where Neri and Mera are waiting just as the Coast Guard arrives to board the UBRI vessel—Benny faxed them to tell them about UBRI's involvement with Opal smuggling. Having losing another piece of the Synchronium, Dr. Hellegren tells Kal that his most important

A large quake hits keeping Lena from accessing HELEN to look for more of the Synchronium. Cass and Benny sneak into the UBRI offices on ORCA where they overhear Dr. Hellegren talking to a Mr. Lee about a trade for a piece of the Synchronium that Mr. Lee has. Wanting to get this new piece before Hellegren, Cass, Benny and Lena gain entry into Mr. Lee's office building to retrieve the Synchronium. Cass and Lena are caught by security, but Benny, unsure about whether or not to flee the building, goes back and rescues the girls from Mr. Lee's office. Jason and Brett are told about the Synchronium in Mr. Lee's possession and they make plans to steal it when Mr. Lee brings it to ORCA to give to Dr. Hellegren. Meanwhile, Brett goes back to the island to search through the ship one last time, he is joined by Mera and Kal. Separating himself from Mera and Brett, Kal sneaks off to follow Neri hoping to discover where she hides the Synchronium. Charlie warns Neri and Kal is discovered. Back on th

The cadets' exam results are in and after looking at her's, Sallyanne tells Jason he would be better off with another partner. Mera reveals to Neri and her friends that Charlie's song is the trigger that activates the Synchronium. Kal overhears this and quickly goes to tell Dr. Hellegren. Hellegren meanwhile has to contend with his financiers who are anxious for results. Mera is taken to ORCA and introduced to Benny, Cass and Lena. Neri and Mera talk Lena into stealing the key her father wears around his neck—it is the only way to gain access to the Synchronium that UBRI has. Outside the Hellegren home, Kal makes a surprise appearance wanting to help. After Lena gets them into the house and Neri is about to get the key, Kal intentionally knocks over a vase waking Hellegren. They are all able to escape but do not get the key. Disappointed about her scholastic performance so far, Sallyanne wants to quit but decides against it after saving Jason when a bulkhead is breached.

Kal is in the lap of luxury at UBRI, his room filled with all sorts of toys and games. Kellar, making reference to his failed relationship with Lena, angers Dr. Hellegren by suggesting he is treating Kal like an ""obedient son."" Hoping to find out where UBRI is keeping Kal, Cass and Brett take to the ORCA air ducts planning to break into UBRI's offices on OCRA. Discovered by UBRI security, they must quickly retreat at which time Brett loses his ID. UBRI identifies the intruders from Brett's ID and Dr. Hellegren seizes upon the opportunity to help him return Kal to his friends. About to release Kal, Dr. Hellegren tells him he is to discover where Neri keeps the pieces of Synchronium and report back to him, he also teaches Kal how to lie, and again promises Kal control of the island if he cooperates. Cass and Brett return to the air ducts in onother attempt to find out where Kal is being kept. Kellar is prepared and makes sure the two can hear her as she describes in detail UBRI's plans t

Brett locates another piece of Synchronium but interrupts Jason's training exercise to tell him the news. UBRI has also located the piece and mount an effort to retrieve it. Lena is back on ORCA looking for clarification about her father, she learns nothing from Brett but does meet Kal. Jason, Brett, and Neri go after the second piece of Synchronium, it is far inland and they must go by camel. Arriving after UBRI, who have already recovered the Synchronium, the trio is spotted and pursued by Kellar who they are able to elude on their sure-footed camels. Dr. Hellegren begins studying the piece of Synchronium and discovers that it generates a tidal force.

Neri goes to ORCA to see how Jason and Brett are going with their search for the Synchronium. Dianne takes the opportunity to ask her to help Winston with his dive test which she agrees to do. When Neri doesn't return to the island on time, Kal takes the opportunity to go back to ORCA. On ORCA, Kal manages to get signed up for Morgan's fitness class (she's very impressed with him) and gets a date with Marika, which Jason is able to speed him through. Neri helps Winston through his test by getting him to believe in himself. After Lena's visit to ORCA, Kellar warns her that her curiosity may reveal things about her father she might not want to know.

Concerned about Kal's development, Neri asks Jason to talk to him. After telling him to stay on the island, Kal follows Neri to ORCA. Brett, Benny and Cass are given diving classes for their failed practical joke on Morgan. After their lesson, Benny sees Kal aboard the boat starting the motor and then diving overboard, he tries to tell people what he saw be no one will believe him and instead accuse him of starting the boat. Dr. Hellegren brings Lena to ORCA where Jason and Brett tell her about some of the things her father has done but she won't believe them.

Jason and Brett are about to force the chamber open when Neri finds the controls that open the chamber and revive it's occupant. He comes to and says his name is Kal. He is shown around the island where he seems to be content to live. Brett and Jason are surprised when Kal says he will take a subordinate role in relation to Neri, as is done on his own planet. Benny covers for a girl caught cheeting on an exam and is also disqualified. Lena Hellegren makes a surprise appearance at UBRI forcing her father to take her home where she convinces him to let her remain instead of being shipped off on vacation by herself.

Neri continues to look for Ka but Jason suggests Kal is just trying to teach them a lesson by staying away. Neri receives another warning from Mera. Lena locates another piece of the Synchronium but without Kal to pinpoint its location, she gets HELEN to calculated possible sites. Dr. Hellegren gets Kal talking about Neri, Jason and ORCA. Kellar leads a UBRI team to retrieve the Synchronium piece while Dr. Hellegren stays behind to talk with Kal. The kids locate the Synchronium at the bottom of a seaside cliff and Jason repels down to get it as UBRI, who have been observing the kids, closes in. The others must flee with Neri to ensure safety, forcing Jason to hand over the Synchronium to Kellar. Jason overhears Kellar saying that they have Kal. Dr. Hellegren gives Kal the choice to leave or to stay with him and work towards possessing the Synchronium themselves. Kal, captivated by the power he is being offered accepts Hellegrens proposal to work together.

Shelby requisitions the minifin to get a closer look at the underwater pyramid, Diane assigns a reluctant Jason as his pilot. Near the pyramid, they encounter a group of commandos and come under attack. The minifin loses power and heads to the ocean floor. Jason is able to jump start the minifin using the battery from Shelby's GPS receiver and brings them safely back to ORCA. Shersheba and her commandos search Neri's island, Neri and Mera hide in a cave but when Shersheba closes in, she and her commandos are frightened off by a group of birds. Ilona eavesdrops on Shelby's report to Richter and reports what she's heard back to Malakat. Hauser interrupts Ilona's transmission and begins to grows suspicious of Ilona. The president of the Global union gives Praxis the authority to take over ORCA to use as a base from which to attack the underwater pyramid.

Jason gets his boat license and goes out to sea to sink a drift net. Charlie gets stuck in the net and Neri tries to save him, but gets stuck also. Brett chases a tree frog in the forest and falls into quicksand. He starts screaming for Jason and the sand sucks him deeper but he is rescued. When Jason realises what has happened, he works against time to free them both and Neri reveals a secret place to Jason.

Vanessa Lane comes to ORCA and ends up in the same class as Jason. Brett, Zoe and Froggy play a trick on Vanessa and she gets back at Brett and leaves him in a broken boat out at sea. A storm comes up, so they can't search for him. He strands on Neri's island and meets Neri, and tells Jason about her when he comes back.

Dianne is at ORCA Pacific headquarters for her interview, she is surprised to discover her exhusband in the role of interviewer and more surprised to learn the job is hers if she wants it. A return visit is made to the pyramid by Neri, Jason, and Brett. Neri finds a way in and the boys follow in the minifin.Exploring the pyramids interior, Neri activates a holographic recording which relays a cryptic message about a quest. A doorway is opened revealing a swirling vortex which pulls the trio in. They reemerge in another pyramid, and upon exiting, discover that they are in Egypt! Agents Shelby and Hauser begin their search for the receivers of the alien transmissions while Malakat and Shersheba continue their own search.1998 AFI award nominee: ""Best Childrens Television Drama"" (Jonathan M. Shiff)

Neri, Jason, and Brett wander into an archeological dig and meet Professor Malakat and Shersheba. Finding the minifin abandoned, Winston tracks the signal from Brett's vid-phone to Egypt, but discounts his findings as a phantom signal. Back in Egypt, Malakat begins to take an interest in the travelers he's taken in, he has Shersheba befriend Jason hoping to find out more about Neri. Jason is able to make a quick phone call to ORCA and tells Cass where they are. Not long after, Malakat is in contact with the boys mother promising to send them back to Australia, he then tells Jason that Neri will have to stay behind due to problems verifying her identity. From an analysis of the material in Neri's clothes, Malakat determines that she is not from Earth and when Shelby and Hauser enter the camp, he directs the agents to the kids. Forced to make a quick escape, Jason commandeers a jeep and the trio drive off, joining a tour group headed back to the ""Pyramid of Mystery."

From the DNA sample obtained from a strand of Neri's hair, Praxis identifies Neri as an alien and makes her capture their top priority. Wandering in the desert looking for the Pyramid of Mystery, Neri, Jason and Brett get a ride from two Bedouins who take them back to their camp. Worried they've been picked up for the reward, when Neri rescues a young girl from a well, the trio become welcome guests. They are told a story about a Bedouin man who was abducted by people who ""live like fish."" The next morning they are taken back to the well that holds the entrance to the Pyramid of Mystery, they are spotted by Malakat and Shersheba who, after summoning Shelby and Hauser, pursue them into the pyramid.Inside the pyramid, Neri locates a golden ankh and opens the water portal allowing her, Jason and Brett to escape, emerging on the other side, they discover they've been transported to a cave in the outback.

Praxis closes in and apprehends the kids at the farm. Jason and Brett are returned to ORCA while Neri is transported, by boat, to Praxis headquarters. En route, Charlie jostles the boat allowing Neri to escape and jump overboard.Cass locates the bug Praxis used to follow Jason, Brett, and Neri to the farm—it was hidden in Jason's watch. Jason, Neri and Brett return to the underwater pyramid, placing the Praxis transmitter on Charlie as a decoy. Activating the holographic image of Shalamorn, her message informs Neri of a crisis on the Ocean planet and tells her that she is a princess destined to lead her people. Meanwhile, Malakat and Shersheba have arrived in Australia to begin their search for the underwater pyramid.

Shersheba makes a surprise visit to ORCA and Dianne gives Jason the task of showing her around the station. Louis pesters Winston about the magnetic anomaly and threatens to tell his father, ORCA's second in command, until Cass brings up the matter of Louis' use excessive of his father's ceredit card. Shersheba asks Jason to give her a tour of the reef which he reluctantly agrees to do. While watching Shersheba dive, Jason jumps in after her when she appears to be drowning. Jason is unable to find Shersheba but she is pulled to safety by Neri who Charlie called away from the pyramid to help. Back in the boat, Malakat suddenly appears and Shersheba quickly recovers. A struggle ensues but Jason and Neri are able to push Malakat and Shersheba overboard. As Jason and Neri make their escape, Neri comes to the realization that Malakat and Shersheba are from the Planet of the Oceans. Back in their seaside residence, Malakat is able to discover the location of the underwater pyrramid using inf

Brett and Jason are out testing a new diving suit when Jason encounters a strange bright light while under water, the pair quickly leave and head off to see Neri. Back on ORCA, Winston is puzzled by a magnetic anomaly on his scans of the ocean floor, even more strange is that the anomaly is in the shape of a perfect square. Dianne announces that she is going to pursue the vacant position of ORCA Commander. Jason matches the location of Winston's magnetic anomaly to where he saw the strange lights, Neri is also intrigued by the region prompting a closer investigation of the region. Neri swims out to the sight with Jason and Winston following in the minifin, ORCA's new underwater submarine. What they find surprises everyone—a huge underwater pyramid. Meanwhile, at Praxis headquarters (Preventative Response And eXtraterritorial Intelligence Service), agents Jake Shelby and Elly Hauser are dispatched to Egypt where reports suggest signals from outerspace are being received.

Vanessa and Jason go out on a mission with the boat but Neri warns Jason that an earthquake is coming, so they return. Commander Lucas gets angry but the earthquake is for real and Damien and Lee get stuck in a room leaking water. Froggy pulls a trick with the computer called HELEN which stands for Hydro Electronic Liaison Entity 3000{} to try to get them out.

On the Ocean Planet, Mera is pursued by the rebels but is able to reach safety in the Pyramid of the Elders. A group of rebels arrives on Earth. They pursue Neri are driven off by Jason and Brett in the minifin. Shersheba leads an assault on the Pyramid of the Elders. Mera escapes to Earth with a new Golden Ankh moments before the elders trigger the destruction of the pyramid. As the Pyramid of the Elders is destroyed on the Ocean Planet, back on Earth, the underwater pyramid returns.

Leaving the cave to find help, Jason is found by Jackhammer who drives him back to the others but won't take them with him citing a legend about a ""whale woman"" who was pursued after leaving the very same cave. Winston locates the group in the outback but Praxis, after intercepting Winston's transmissions to the region, head out to capture the trio. Hauser and Shelby meet up with Jackhammer who leads the agents astray long enough for Jason and Brett's father to arrive in a helicopter to rescue Neri and the boys. Before leaving, Neri gives Jackhammer the golden ankh for safekeeping.

Praxis's return to ORCA prompts Cass and Brett to seek Winston's help to delete all of Helen's records of Neri. Louis observes them through the airduct and informs Shelby and Hauser of what is happening but by the time the agents react, all of the records have been erased. Neri and Jason dive to the underwater pyramid, Neri activates the Shalamorn hologram and the pair are told about a rebel faction on the Ocean Planet that is opposed to a peaceful migration to earth. Soon after Malakat and Shersheba arrive and tell Neri and Jason of their own plans, as part of the rebel group, to use the power of the pyramid to melt Earth's polar icecap to prepare the planet for their people's arrival. Malakat also tells Neri that he caused the spacecraft that she and her father were on to crash to earth. Malakat demands the Golden Ankh be tuned over to him, but Neri and Jason escape through the water gate. They emerge in the same cave in the outback that they were in before and find Jakamarra waiting

Neri is brought back to ORCA but she cannot be revived. Malakat and Shersheba successfully charge the ankh. Praxis destroys all their records of Project Sphinx and agent Hauser hands in her resignation. Louis calls agent Shelby to tell him that Neri was brought back to ORCA, but with the project over Shelby desmisses him. Jason and Brett take Neri back to the underwater pyramid, Malakat and Shersheba arrive soon after to use the charged ankh. As Shersheba is about to place her hand on the sacret stone, Jason places Neri's hand there ahead of her. The pyramid comes to life and Neri is miraculously revived. In anger, Shersheba destroys the ankh bringing about a large seismic event. Jason and Neri escape the pyramid with Neri and they watch as the pyramid slowly sinks into the ocean floor. As Neri is taken back to ORCA for a reunion with Dianne and Winston.

Brett's birthday party proves to be a big hit with his friends but Brett is disappointed when he doesn't receive a gift from his father (his parents are divorced). Following a heated argument between Dianne and Commander Lucas over the acquisition of new equipment for Dianne's research, Winston suggests that they should make an effort to be nicer to one another. Talking with Froggy and Zoe about divorce and stepparents, Brett gets the idea that there may be a relationship at work between his mother and Commander Lucas, especially when he sees how nice they are being to each other of late. Brett's belief seems to be validated when he finds himself being given a private tour of the bridge by Commander Lucas, during which he decides to casually mentions some unsettling details about his mother hoping to disinterest the Commander. After saving Jason from a shark while swimming near her island, Neri tells Jason her life story—that which she remembers.

Jason's frequent use of the boats results in Commander Lucas banning him from using them for a period of one week, effectively cutting him off from Neri. A pair of eager developers arrive on ORCA expressing an interest in a nearby island—Neri's. Jason volunteers to be their guide on their visit to the island and once on the island he and Neri are able to scare off the developers keeping the island safe. When Jodie takes forty dollars from a lost wallet, Vanessa forces her to spy on Jason and Brett in order to keep the theft a secret.

The search for Neri's sister Mera is underway. Mick asks Froggy to use his computer to change his grades but Froggy won't do it. Commander Byrne isn't pleased with her son's grades but Mick once again charms his way out of trouble. Rocky fixes up an old boat so Jason can leave ORCA as he pleases. Helping Winston with a survey, Joanne falls overboard. She is rescued by Neri, but to keep her a secret, Joanne is lead to believe that it was Winston who saved her. Dianne and Winston discover that Neri's presence enhances their scans of the seafloor. Dr. Hellegren discovers Neri is the creature that accompanies Charlie. An old newspaper article leads Jason and the others to the man who found Mera.

Jakamarra takes Jason and Neri to where he has hidden the Golden Ankh. Malakat is able to determine the location of the cave in the outback and informs Praxis of the Neri's whereabouts. Brett interrupts a meeting between Malakat and agents Shelby and Hauser with an anonymous phone call to inform them that Malakat and Shersheba are aliens themselves. Shelby and Hauser track Neri and Jason through the outback, and after being joined by Malakat and Shersheba, they find Jason, Neri and Jakamarra and close in. Agent Hauser pursues the kids up a cliff face but she slips at the top. Neri sees Hauser slip and goes back to rescue her allowing Agent Shelby to close in and apprehend her. Shersheba takes possession of the Ankh but Jakamarra steps in to grab it and tosses it to Jason. Jason's father arrives by helicopter and Neri tells Jason to escape with the Ankh. Reluctantly, Jason boards the helicopter and must watch as Neri is taken away by Praxis.

Neri is taken back to Praxis headquarters where she is interrogated. Neri's captures prompts Jason to put the Ankh out of reach of Malakat and Shersheba, he drops it into the deep ocean. Neri's deteriorating condition and Praxis's uncaring treatment of her results in Hauser developing a sympathetic attitude towards Neri. By showing Jason footage of Neri from Praxis's own security cameras, Shersheba convinces Jason that tshe and Malakat have Neri and offers to return her in exchange for the Ankh. Jason and Brett arrive at the transfer location but Shersheba, disguised as Neri, grabs the Ankh and runs back to Malakat, at which time they discover the Ankh to be a copy. Later, Shersheba sneaks back onto ORCA and, with help from Louis, is able to discover the location of the real Ankh. She retrieves it and returns triumphantly to Malakat.

Jason and Winston climb the mountain on Neri's island to install surveillance equipment. Making their descent, Winston is bitten by a snake and falls the rest of the way down. Meanwhile back on ORCA, technicians are preparing to upgrade Helen but when they shut her down improperly, the entire station loses power. Neri and Brett trek across the island for a rare flower that can counteract the snake venom while Cass leads the effort to get Helen back online. On the distant Planet of the Oceans, a fast acting virus has ravaged the world's oceans and Malakat, as the leader of the rebel faction, plans an invasion of the Earth. On ORCA, a signal from deep space has been picked up by the receiver on Neri's island—it is Malakat scanning for any signs of the underwater pyramid.

Jason and Brett return with Neri to their father's farm for Jason's birthday but soon after arriving Paul is called away on business. While at the farm, Neri has a series of encounters with a strange young girl by the name of Emma. Neri helps her overcome her fears but afterwards, a story told by Paul Bates and a farm hand reveals the girl's true identity. Back on the Ocean Planet, Mera faces an angry crown of people demanding answers to the problems facing their planet. The installation of the new HELEN 6000 computer is completed on ORCA.

Richter talks Elly Hauser into rejoining agent Shelby on newly a reopened Project Phoenix. Winston, Cass and Brett program Helen to provide 'just the facts' if questioned about pyramids. Louis overhears them trio talking about pyramids and tells Shelby and Hauser what they're doing. After a little prodding by Shelby, Helen reveals the existence of the underwater pyramid to the Praxis agents. Shersheba leads a group of commandos in a search of the nearby islands for Neri and Mera but they are unsuccessful until Brett is observed in a boat heading towards an island, Shersheba informs Malakat of this and plans a search of this island. After showing her around the station, Louis challenges Ilona in a race to the galley.

With an attack against the aliens pending, all non-essential personnel are being evacuated from ORCA. Louis informs agent Shelby that Hauser has kept Ilona of the evacuation list which leads to Praxis discovering that she and her mother are both aliens. Louis also manages to be taken off the list prompting Brett and Cass to stay behind as well. Believing Malakat and his commandos to have evacuated the pyramid as promised, Jason and Neri go to the pyramid but, along with Mera, they are soon captured when Malakat and his commandos reappear from within the pyramid. The impending launch of the nuclear torpedo aimed at the pyramid is detected causing all those within the pyramid to flee. Frantic efforts on ORCA to stop the launch succeed but Helen admits responding not to Dianne but on orders from ""a higher power."" With the launch stopped Shersheba and Malakat return to the pyramid and use the golden ankh to activate it. Malakat's first order is to begin the melting of the polar ice caps.