Bloo is jealous of Wilt getting special attention for the number of abandoned imaginary friends he brings to Foster's, so he tries to rescue imaginary friends just like Wilt does. When Bloo finds a man in a cell-phone suit and thinks he's a friend, he takes him to Foster's, thinking everyone will give him more praise than they gave Wilt.

Mac and Bloo fall for Frankie and become wildly jealous of each other and everyone else.

Mac and Bloo get embarrassing footage of Mr. Herriman while conducting interviews for a Web site.

A new Imaginary Friend named Berry has her eyes on Bloo, and Mac stands between them.

Mac gets the gang to join a bowling team, but ends up getting booted off.

When Mac visits Foster's, Bloo insists on showing him something on the roof, but the two become lost and cannot find their way back downstairs. Meanwhile, in the dining room, the others secretly sneak food while Mr. Herriman insists they wait for Bloo before starting dinner.

Bloo and Mac play with each other in the mud while raining, which causes them to get sick. As Mac is taken home by Frankie, Bloo misses out on the scary movie the friends had planned to watch that night. When Wilt, Eduardo, and Coco begin to believe that the ghost in the movie is real, they mistake a pale Bloo to be the ghost. Meanwhile, Frankie gets locked out of the house in the rain after dropping off Mac and, as she tries to get back in, feels she's being stalked.

It's Adopt-A-Thought Saturday, an event that focuses on getting good friends adopted on the weekends when children are out of school. Mac and Bloo find out what Adopt-A-Thought Saturday is about after their good friend Jokey gets adopted and spend the day forcing the friends back into the house so that they won't be adopted.

Bloo, Wilt, Eduardo, and eventually more guests arrive at Mac's apartment for a slumber party that Mac didn't plan. But because they are all so loud, Mac's mom or Terrence could wake up and get them all into trouble.

Mac takes Bloo to school for show and tell. The kids love Bloo so much that they imagine their own variations on Bloo. Hundreds of Bloo clones are created, and Bloo dubs them his minions and himself leader. Mac plans on going to take Bloo to see The Ice Charades, but with hundreds of Bloos, he can't figure out which is the original.

An evil imaginary friend sets a sinister plot in motion against Bloo, and Mac and the home's residents must save him.

Mac sends Bloo to live at Foster's Home for Imaginary Friends after being told by his mother that he is too old to have an imaginary friend. Once they meet various residents and get to know Wilt, Eduardo, Coco as well as the home's staff, the problem arises as they realise Bloo may get adopted if he moves in.

Mr. Herriman grows frustrated with Bloo's inability to follow the house rules and threatens to evict him. Under pressure, Bloo accidentally breaks a bust of Madame Foster and attempts to repair it before Mr. Herriman discovers the damage.

Eduardo runs away from the Home to prove his bravery, but ends up over his head in a fight.

Mac starts to doubt Santa's existence when a hoard of imaginary Santas appear. Bloo sets out to prove that he's real.

Mac tries to thwart Bloo's plans for a party.

Terrence has an idea to make up a friend named Red to beat Bloo up with so he can bully Mac to his heart's content, though the friend he creates ends up friendly instead of mean and violent.

When Mr. Herriman tells Bloo that Mac is moving, Bloo decides to give him the best day ever, though things do not go as he plans. All day, Mac does things with everyone but Bloo, making him angrier after every disappointment.

The home needs a new roof, so Bloo tries to fund it with a cookie drive.

Frankie faces a tough campaign against Mr. Herriman as they both compete to be president of Foster's.

A Seeing Eye Friend loses his blind kid, and the gang helps find him.

On Madame Foster's birthday, Frankie realizes she has forgotten to buy streamers for the party, prompting Mr. Herriman to send her to the store. Mac, Bloo, Eduardo, Wilt, and Coco accompany her but wander off in the mall and become involved in various mishaps, slowing Frankie down.

Mac races to save Bloo from the sinister scheme of the evil imaginary friend.

Foster's is going to be on TV, and Frankie wants everything perfect. Meanwhile, Cheese keeps showing up at Foster's, despite being told numerous times that he doesn't live there. In an attempt to keep him out, Mr. Herriman installs a security system. Unfortunately, due to his misreading of the directions, nobody knows the password except for Cheese, who memorized the code as a song. It is now up to the gang to get Cheese to recite it, and craziness ensues.

The friends have to make their own fun when rain forces them to cancel a trip to a water park. They decide to upload videos to ViewTube, while Bloo, sulking because of their cancelled trip, tries to ruin everyone's fun.

Bloo entertains Mac with an action-packed story about a crystal "potato" of power. A little boy (Eduardo), an alien (Coco), a hermit (Wilt), a magical fairy (Frankie), and the Superdude (Bloo) attempt to protect the crystal potato from the evil Lord Snooty (Mr. Herriman), who is taking away all the fun in the land ruled by the Queen (Madame Foster).

Frankie, Mac, Bloo, Mr. Herriman, Wilt, Eduardo and Coco must find a way to escape the mysterious realm of an imaginary friend.

Bloo is convinced Mac is going to be married, so he tries to act mature in order to impress Mac.

Bloo is sad about Eduardo getting adopted and holds auditions to get an alternate one; meanwhile, the residents get letters from those that were adopted in the latest Adopt-a-Thought Saturday.

Mac discovers that an impostor has been checking out library books in his name and hires a detective to find the crook.

The Duchess is adopted by Mac's neighbors, and the Foster's don't want to take her back.

Coco escapes from Foster's, and a chain of events has her on adventures all over the world.

An imaginary pen, that resembles Abraham Lincoln, is caught with a student cheating on a test by Mac's teacher. He is saved from the classroom's closet by Mac and Bloo along with his au pair, a green ogre named Moose. The Lincoln pen cons Madame Foster into a new plan to adopt an overcrowded home to unsuspecting adopters for a fee, then takes over the house, planning to turn it into a casino.

Bloo becomes tired of always losing to Mac at everything, so one day at the Prize Hive, he challenges Mac to a 30-mile race back to Foster's.

It's time for the 5 Year Creator Reunion Picnic, where imaginary friends' creators come to Foster's to see their imaginary friends. However, once again, Wilt's creator doesn't show up. Wilt, believing that his creator is still mad at him for a past let-down, sets off on a cross-country journey to find an imaginary friend that he lost to in a past basketball game and challenge him to another game to set things straight.

Bloo becomes a celebrity as a deodorant mascot, but fame taints his relationship with Mac.

This episode tells the story of "The Big Cheese" through the eyes of a pea-sized imaginary friend named Peas, detailing how he helped Frankie turn a negative into a positive.

Bloo learns about a garage band known as Pizza Party. After realizing that he cannot be in the band, he starts his own musical act and inadvertently causes the creation of a concert.

A deliriously ill Bloo attends Mac's birthday party and daydreams about his adventures as a superhero.

Bloo gets a nasty case of the hiccups and must get rid of them before the big Imaginary Friend Pageant.

Bloo visits a retirement home and inadvertently disguises himself as a senior, getting to live there and being pampered all day long. When Mac finds out about it, Madame Foster teams up with him in order to get Bloo out of there.

Eduardo tells some little white lies to the nursery residents of Foster's, and now has to cover his tracks so they can't catch up to him.

Bloo tries to make Mac cool, and succeeds all to well.

Frankie and Mr. Herriman host a party at Foster's and ask the friends to stay outside or upstairs.

A plan to mellow out Mr. Herriman backfires when conditions at the house quickly deteriorate.

Bloo tries the old peanut brittle can filled with snakes trick, thinking it as the ultimate Halloween prank after strapping Mac to his bed so as to not allow him to go trick-or-treating because of his sugar rushes. However, when Mr. Herriman tries his trick, Bloo thinks it has gone awry, and Mr. Herriman becomes a zombie, much to the shock of the other residents.

Bloo is challenged to a fight at the end of the day, but he would rather avoid it.

Bloo, along with the rest of the house, plan a surprise party for Mac. However, Mac wants no part of it and tries to destroy their plans.