Frankie and Madame Foster are leaving for the day, so Mr. Herriman is placed in charge of the house. However, Madame Foster inadvertently gives Bloo the idea to throw a wild party, and he plans to do so without Mr. Herriman’s consent. While they manage to come up with a method to distract Mr. Herriman, […]

When a recent adoption leaves a room at Foster’s vacant, Bloo, Coco, Wilt, and Eduardo all fight over it, along with another friend named Peanut Butter. Everybody soon starts to make contests to see who will win the room, which leads Bloo to try to make contests that he can cheat at.

When Mac visits Foster’s, Bloo wants to show him something up on the roof, though when it is time for them to go back downstairs, they find themselves lost and unable to get downstairs. Meanwhile, everyone in the dining room sneaks food when Mr. Herriman is not looking after he insists they wait for Bloo […]

After beating Mac’s high score in a video game, Bloo goes to rub it in his face at school, but is horrified when he comes to the conclusion that Mac is a nerd. When Mac arrives, Bloo quickly works to make Mac cool, but none of their ideas work. Only when Mac says he does […]

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 is a friend, he takes him to Foster’s, thinking everyone will give him […]

When Foster’s needs a new roof, Bloo bakes up a plan to sell Madame Foster’s amazing cookies after his first attempt at selling lemonade in the middle of winter fails. When they finally get enough money to buy a new roof, Bloo sets himself up as the town’s cookie mogul.

In this double-length special, it is time for the Five Year Creator Reunion Picnic, where imaginary friends’ creators come to Foster’s to see their former friends. One friend’s creator, however, is missing: Wilt’s. Wilt, believing that his creator is still mad at him for a past let-down, sets off on a cross-country journey to set […]

The day of Madame Foster’s birthday comes around and Frankie has forgotten to buy streamers, so Mr. Herriman orders her to go get some. Mac, Bloo, Eduardo, Wilt, and Coco tag along, but wander off while in the mall and get into various scrapes, slowing Frankie down.

Mac makes a home movie about Foster’s Home for his school project, but Bloo edits it into a humorous film with flatulent sound effects. This leads him to be entered in the state student film festival. With Bloo’s help, they make “T-Rexatron Alienwolf III, A Prequel in Time: The Unrelenting” but Edwardo tapes over Bloo’s […]

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

One morning, Mac wakes up to find that he is unintentionally created another imaginary friend named Cheese. Madame Foster allows the same rules as there are for Bloo, but Bloo does not approve of his new brother. After many attempts to get rid of him, Cheese disappears on his own. Bloo realizes that Foster’s could […]

A rich benefactor is considering giving money to a charity, and visits Foster’s to see if it is worthy. Mr. Herriman gets Mac and Bloo to keep Coco out of the way, but in the end, it is only when the benefactor mistakes Coco as Mr. Herriman’s wife that he considers Foster’s, and invites them […]

When rain forces them to cancel their trip to a water park called Monsoon Lagoon, the gang decide to have their own fun, by making videos and uploading them to ViewTube (a parody of YouTube), while Bloo is constantly sulking because of their canceled trip.

Mac and Bloo ask Mr. Herriman to go camping. He refuses to let them go, but Madame Foster thinks it is a great idea. After they arrive, Bloo has eaten all the food. Mr. Herriman then sets off into the woods in search for more food, and then meets wild bunnies. Meanwhile, back at camp, […]

On Adopt-A-Thought Saturday, Madam Foster renews a feud with her cranky old neighbor Old Man Rivers with disastrous consequences. Meanwhile, Bloo tries to settle a score of his own with Rivers’ irritating grandson, Young Man Rivers.

When the whole house goes to a fair, Mac and Bloo compete to see who will throw up last on a ride called the Vomit Comet. Bloo ditches Mac to ride in Madame Foster’s Firebird, but a “quick” stop at the fabric store across the street from the fair suddenly turns into a nightmare for […]

Foster’s is being put on the local news and Frankie wants everything perfect, but the only thing standing in her way is Cheese who keeps showing up at Foster’s uninvited. In an attempt to keep him out, Mr. Herriman installs a security system. Unfortunately, due to misreading the instructions, everyone gets locked out of the […]

Eduardo runs away from the home to prove that he is not a coward. Meanwhile, Terrence is looking for an imaginary friend to compete in the Extreme-O-Saur Battle, and he comes across Eduardo. While Mac, Bloo, Wilt, and Coco search for Eduardo, Terrence uses him to fight against huge imaginary friends at the junkyard.

In the series finale, Mr. Herriman explains that Mac is moving, Bloo decides to give him the best day ever, though things do not go as he planned. Through the entire day, Mac does things with everyone but Bloo, making him angrier and more emotionally hurt after every disappointment. He also gets more pressured every […]

When a large and dangerous imaginary friend starts destroying the city, a superhero friend named Imaginary Man comes to save the day, and Mac becomes his biggest fan. When Mac gets recruited as Imaginary Man’s sidekick, however, he ditches Bloo and starts to forget about their friendship. As a result, Bloo joins forces with Nemesis, […]

An imaginary pen resembling Abraham Lincoln is confiscated by Mac’s teacher after she catches him helping his creator cheat on a history test. Mac hatches a plan to rescue the friend – along with his au pair Moose – from the classroom closet, but the imaginary Honest Abe does not quite live up to his […]

During the production of the home’s newspaper, Uncle Pockets, the most frequently adopted imaginary friend to come to Foster’s, returns yet again. Uncle Pockets’ charm drives all the other friends’ attentions to him, making Bloo jealous. Bloo then decides to try to expose Uncle Pockets as a fraud through the home’s newspaper.

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

After appearing on local television news trying to outperform Eduardo, Bloo becomes a celebrity, doing commercials, television shows, movies and personal appearances. As time goes by, he discovers fame is not all it is cracked up to be.