Tom and Kaz go on a topsy-turvy adventure when they look for Sarah and Peyton in Kirvak Mound. They soon discover that the effects of Kirvak Mound has deaged Sarah to a little girl and aged Peyton to an old man. They now have to evade prehistoric creatures to find their way back. When they look for Sarah, they find other portals leading to various points in history which would lead to various futures.

Tom finally has a new scan of Maxxor, but when he transforms into the awesome OverWorld leader during a Drome match, Tom makes a startling discovery – the once brave warrior is now a quivering coward. Seeking to unravel the mystery of Maxxor's illness, Tom must 'port to Lake Ken-i-po to consult with Najarin – if he can survive the Mugic trap inside the old wizard's castle.

Troubled that the leader of the Ancient OverWorld is an ancestor of Chaor, Tom goes to see Najarin to learn more about the history of Perim. Puzzled by Najarin's strange behavior, Tom returns to Ancient Kiru City to discover it has been attacked by Kaal, a diabolical UnderWorlder who holds the pre-historic Perimites in his fiery clutches.

After a seventh, hard-won battle in the Hotekk Drome, Tom gets the call he's been waiting for: it's CodeMaster Hotekk, challenging him to a CodeMaster Match.

Peyton wants to trade Mipedian creatures for Tom's scan but Tom declines as he distrusts them after what happened with Reggie and Mudeenu. He says Overworlders are better so Peyton takes him to the Mipedian desert. Tom's opinion changes when he and Peyton are attacked by an evil scorpioid Overworlder named Slruhk.

When Tom and Kaz aid an OverWorld diplomat named Raznus, they earn Maxxor's thanks. All seems well until Tom makes a disturbing discovery back in Chaotic. Is Raznus truly Maxxor's best friend... or his most devious enemy?

Tom flees to Perim after Kaz accuses him of cheating. His exile takes a treacherous turn when Tom runs into a gang of rogue Chaotic Players who are destroying rare Locations in the OverWorld. Tom is pressured into joining their scheme and soon has nowhere left to run. After thwarting their plan, it was revealed Tom never cheated, it was all a plan he and Kaz made to stop the rogue players.

After seven victories in the Crellan Drome, Tom is challenged to another match by CodeMaster Crellan. In preparation for his match, he scans Mugic that he is tricked by Klay and Krystella into believing it will double his power, but it really switches their stats. Can Tom overcome this bump in the road and defeat CodeMaster Crellan?

It's good news/bad news time for Chaor. The good news: Ulmar's brand new giant robots are bigger and badder than ever. The bad news: they're totally out of control!

An unusual UnderWorld Creature named Phelphor is found frozen inside Ice Pillar by UnderWorlders. In the castle, Chaor, Agitos, and Takinom are amazed by Phelphor's tale of a lost tribe called M’arrillians and their discovery of the Cothica, Perim's greatest treasure, which they hold behind the Doors of the Deep Mines. Chaor states they will discuss opening the Doors to retrieve the Cothica.

Tom rescues a player in the wilds of Perim and battles him to gain some tips, finding that the player is actually a CodeMaster.

Kaz tags along with Tom hoping to get a new scan of his hero, the mighty Maxxor. Their quest takes the two friends across Perim, where they are caught in the crossfire of a volcanic battle, then brave a treacherous trip through the ghastly Gloomuck Swamp. As Tom and Kaz close in on their goal, they are shocked to learn that the greatest peril they face is Maxxor himself!

Chaotic is a game of stealthy and strategy, incredible Creatures and miraculous "Mugic" sweeping the globe. Players trade unique, coded Chaotic cards online and in person. When Tom's best friend Kaz insists Chaotic is a real place where players can transport to and do battle, Tom writes it off as a fantasy gone too far.

H'earring leads Kaz to where Milla'iin was last sighted but ends up taken over by his mind control. Meanwhile, Tom is constantly bugged by Evan to battle Tom's Maxxor. Tom is informed by Sarah and Peyton he is an UnderWorld Player and Tom finds Milla'iin on his team.

Tom, Kaz, and Peyton reach Broken Edge in hopes to find new Mugic and BattleGear for Tom's Drome Match.

When Kaz and Peyton are at the Lava Pond to obtain a scan of Zapetur, they are attacked by the M'arrillian Milla'iin, who is doing mysterious work with a hypnotized Khybon. Tom, Kaz and Peyton battle for the attention of a beautiful newbie named Shinwan who exhibits her skill in the Battledome by defeating Klay in her first ever drome match.

Tom promises to save the creatures of Prexxor Chasm from the disease ravaging them. Tom, Kaz, Peyton, and Sarah stop by Lake Morn to see its caretaker Garv, who may be able to help if he gets a sample of the disease.

Chaor and Lord Van Bloot's armies fight, with Chaor going after Phelphor. Phelphor mind controls the guards into opening the Doors of the Deep Mines first, letting out a flood of murky brown water that washes away everything in its path. Tom, Kaz, Peyton and Sarah scan the door as it opens but are forced to port to keep from being washed away.

Both Tom and Kaz have six wins in the Imthor Drome so Tom surprises Kaz with a Drome challenge with the winner going on to face CodeMaster Imthor. However, when Kaz accuses Tom of cheating and Tom admits to it, CodeMaster Imthor bans Tom from Chaotic Battles while it is investigated.

Tom camps out at Lake Ken-I-Po to obtain a scan of Najarin, and decides to track the creature, leading him to a pack of UnderWorld raiders.

During a fight, Kaz discovers that his opponent has a creature he has never faced before: a flying Danian named Vollash. So Sarah vows to get a scan of him, and her search leads to a fateful showdown between a Mipedian spy and the Danian Queen.

While Tom does battle with Peyton in the BattleDromes, Kaz goes on a ScanQuest in Perim to scan the VileDriver.

There’s a new kid in Chaotic! Buzz Jr. is a talented Danian Player. Unfortunately, the boy’s demanding dad is taking the sting out of his game. It’s up to Kaz to show the blustering Buzz Sr. that Drome battling is tougher than he thinks.

Battling in the Crellan Drome, Peyton faces his most fearsome foe ever -- a huge Creature with a titanic temper and pulverizing powers, known as a Mipedian Warbeast. A player named Connor, with help from Klay and Krystella, tricks Peyton into trading 20 of his cards for a scan of the Mipedian Warbeast Blazvatan.

Confusion turns to shock for everyone when Krystella's "goody-goody" twin sister Jycella comes to Chaotic. And when their sibling rivalry erupts, Klay suggests a novel way of settling them: a Chaotic match.

Peyton becomes embroiled in international intrigue when he's kidnapped by a mysterious agent who informs him that his Chaotic expertise is the only thing that can persuade a notorious art forger to work for the forces of good.

Kaz's obsession with scanning Kaizeph, the Lost City of the Elements, leads each of the four friends on a perilous, personal ScanQuest to capture the code of the mysterious "Elemental Servants." They ultimately face off in a four-way battle to determine which Elemental Creature can conquer all the rest.

During a scan quest, Peyton and Sarah encounter the biggest fighter they've ever seen. Kaz, Tom, Sarah and Peyton decide to track down the giant. But trouble comes for Kaz he bumps into a little creature called Hammerdoom Chantcaller who challenges Kaz to the coliseum and he has to battle or be banished from the Underworld.

A hot-shot group of Chaotic players, dubbing themselves the ChaotiKings, offers Kaz a chance to join their prestigious clique. Torn between friendship and popularity, Kaz sets out to become the ChaotiKings' newest member – if he can survive the initiation.

When Tom, Peyton, and Kaz sneak into Castle Mommark to scan some of the geneticist's latest experiments, Peyton accidentally releases the cute little starfish creature Stelgar into the wilds of Perim. Out in the sunlight, Stelgar turns into a giant, rampaging monster. Can Peyton find some way to safely stop Stelgar before Mommark's followers destroy him?

Peyton and Krystella clash in battle while Sarah tells Tom of the Overworld heroine Intress.

When Tom agrees to a match with Klay. Krystalla tells Klay of Tom's strategy before Klay faces him, and Klay uses the Flux Bauble to cause major problems for Tom in the match.

Kaz does battle with an undefeated Chaotic player while Sarah and Peyton tell Tom of the history of Perim and the war for the Cothica.

Kaz gains a new scan that is actually two creatures in one - Borth-Majar. Soon after, he finds himself using Borth-Majar in a match and must master controlling two creatures as one.

Peyton thinks victory is a sure thing when he challenges "Lulu the Loser," a nervous and inexperienced player on a losing streak worse than his own.

Peyton is shocked to learn that he is battling the lead singer of his favorite band, and is offered free tickets to the next concert if he can win.

Chaor's mission into OverWorld territory is threatened when Maxxor finds out about his scheme.

Tom and company explore a giant temple for treasures to scan and discover much more than they bargained for. When one of the defense mechanisms mesmerizes Tom into a deadly trap, the rest of the gang (along with Larina) try to save him and Blazier.

Sarah and Kaz head to Ulmar's lab to get a scan for the Reality Field Generator. Peyton gets a call from CodeMaster Hotekk who would like Peyton to become his apprentice if he can prove himself worthy getting scans from Psikoom City.

After writing a school essay about how Chaotic is a real place, Kaz is sent to a psychologist by his worried mother. If Kaz can't prove he's telling the truth about Chaotic, his mother will take his scanner away.

Raznus, having been assimilated into the Danian Tribe, returns to Kiru City with Danian warriors. They are accidentally discovered underneath Bodal's arsenal and capture Tom, Bodal, and Olkiex. Odu-Bathax decides to raid Kiru City so Kaz runs off to get Maxxor, only for Intress to tell Kaz Maxxor is in the Riverlands.

Sarah is kidnapped by a ghostly Mipedian creature when she and Peyton are on a scan quest. Sobtjek and the other Mipedians learn the M'arrillians have flooded Ropa'Sahhk Desert where the Conjurers live from one of them, Scara. Scara advises they need to join forces with the Warriors of Owayki and Sobtjek takes a squad there.