List of Foster's Home for Imaginary Friends episodes

In the series premiere, Mac sends Bloo to live at Foster's Home for Imaginary Friends after his mother tells him he is too old to have an imaginary friend. There, they meet Mr. Herriman, Frankie, Wilt, Coco, and Eduardo, who explain that Bloo could eventually be adopted by another child. Not wanting to be separated, Mac promises to visit Bloo every day so he can remain at the house. Their arrangement is threatened when Mac's brother Terrence and a sinister imaginary friend, Duchess, attempt to get rid of Bloo.

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.

Bloo learns about a mysterious door in the house that no one is allowed to open. When no one will tell him what lies behind it, he opens the door himself, releasing hundreds of imaginary friends known as scribbles—simple beings created by babies. Although they initially help with chores, their presence makes the others increasingly lazy.

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.

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.

Mac and Bloo use Frankie's digital camera to record interviews for Foster's website, but accidentally capture footage of Mr. Herriman behaving playfully with Madame Foster. Although Mac plans to delete the video, Bloo instead shows it to Frankie and uploads it online. The group then races to prevent Mr. Herriman from discovering his unexpected Internet fame.

A new imaginary friend named Berry arrives at the house and initially appears sweet and friendly. However, she quickly becomes infatuated with Bloo and is determined to win his affection. When he ignores her, she becomes convinced that Mac is standing in her way.

Seeing Red: Terrence creates an imaginary friend named Red to attack Bloo so he can freely bully Mac, but the friend turns out to be friendly rather than aggressive.

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Phone Home: Bloo becomes jealous of the praise Wilt receives for bringing abandoned imaginary friends to Foster's and attempts to do the same. After mistaking a man in a cell phone costume for an imaginary friend, he brings him to the house, hoping to outdo Wilt.

While taking out the trash, Eduardo finds a puppy and decides to keep it, despite dogs being forbidden in the house due to Mr. Herriman's fear of them. Although Eduardo tries to keep it hidden, the puppy escapes and causes trouble, which Eduardo takes the blame for to protect it.

During Adopt-a-Thought Saturday, an event designed to help imaginary friends get adopted, Mac and Bloo are upset when their friend Jokey is adopted. Determined not to lose more friends, they attempt to prevent others from being adopted by keeping them inside the house.

After playing in the mud, Mac and Bloo become sick. While Frankie takes Mac home, Bloo's condition worsens, causing him to miss a scary movie night. When Wilt, Eduardo, and Coco begin to believe the ghost in the film is real, they mistake a pale Bloo for it. Meanwhile, Frankie becomes locked out in the rain and, while trying to get back inside, begins to feel as though something is stalking her in the dark.

Frankie and Madame Foster leave for the day, placing Mr. Herriman in charge of the house. However, Madame Foster inadvertently gives Bloo the idea to throw a wild party, which he plans without permission. After devising a way to distract and remove Mr. Herriman from the house, only one obstacle remains: Mac. Bloo believes a little sugar will keep him occupied, but it instead turns him hyperactive, forcing Bloo to stop him before he ruins the party.

Mac recruits the gang to join Madame Foster's bowling team to help her defeat her rival, Flo Jerkins. However, when Mac is removed from the team, he seeks help from an imaginary bowling guru to improve his skills.

Where There's a Wilt, There's a Way: Wilt tries to watch an important basketball game, but constant requests—and his inability to say no—continually interrupt him.

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Everyone Knows It's Bendy: A new imaginary friend named Bendy arrives at the house and begins causing trouble, framing Bloo, Wilt, Eduardo, and Coco for his actions. Bloo devises a plan to expose him.

Sight for Sore Eyes: When Ivan, a seeing-eye imaginary friend, gets separated from the blind child he assists, the group works to reunite them before the boy comes to harm.

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Bloo's Brothers: Mac takes Bloo to school for show-and-tell, and his classmates love Bloo so much that they imagine their own Bloo knock-offs. The duplicates arrive at Foster's, leaving Mac to determine which one is the original Bloo.

When Foster's needs a new roof, Bloo decides to raise money by selling Madame Foster's cookies. As the plan succeeds, Bloo becomes increasingly obsessed with expanding it into a large-scale business.

Frankie is frustrated about staying in to complete paperwork instead of going out with friends, so Mac offers to do it for her. Grateful, Frankie kisses him on the cheek, leading Mac—and later Bloo—to develop crushes on her. The two compete for her affection, only to discover she is interested in someone else. Jealous, they attempt to sabotage her interactions with other suitors, including a pizza delivery boy and Prince Charming (an imaginary friend). Eventually, they learn her real date is Dylan Lee, and they team up to disrupt the evening.

One morning, Mac wakes up to discover he has unintentionally created another imaginary friend named Cheese. Madame Foster allows him to stay under the same rules as Bloo, but Bloo strongly disapproves of his new "brother." After several failed attempts to get rid of him, Cheese eventually disappears on his own. Bloo then realizes that Foster's may be a dangerous place for someone as naive as Cheese.

The gang visits an arcade, where everyone except Bloo wins large amounts of tickets. Determined to win glow-in-the-dark Dracula teeth, Bloo asks the others to give him their tickets, but they instead pool them together for a rubber elephant. After discovering the toy squeaks, Bloo becomes obsessed with it, accidentally breaks it, and must find a replacement before the others notice.

Bloo prides himself on being funny, though his jokes sometimes offend others. After making fun of another imaginary friend's height, the mysterious "New Guy" challenges him to meet outside at 4:00 to get "squashed."

After trying to outshine Eduardo on a local news segment, Bloo unexpectedly becomes a celebrity. However, he soon learns that fame is not as glamorous as he imagined.

After beating Mac's high score in a video game, Bloo goes to his school to gloat, but is horrified when he concludes that Mac is a "nerd." Determined to fix this, Bloo tries to make Mac cool, but none of his ideas succeed. Ironically, when Mac insists he does not care about being cool, the school's most popular kid, Jamez Withazee, declares him cool and invites him to hang out at "The Rock." When Mac accepts and fails to return to Foster's by 3:00, Mr. Herriman moves to have Bloo adopted.

While the house newspaper is being produced, Uncle Pockets—one of the most frequently adopted imaginary friends—returns once again. His charm draws everyone's attention, making Bloo jealous. Determined to prove he is a fraud, Bloo sets out to expose him through the newspaper.

A wealthy benefactor visits Foster's to decide whether to donate to the home. Mr. Herriman asks Mac and Bloo to keep Coco out of sight, but the benefactor mistakenly assumes Coco is Mr. Herriman's wife, improving his impression of the house. He later invites them to his mansion to make a final decision. Mr. Herriman attempts to teach Coco sophistication, while Mac and Frankie try to teach Bloo about sarcasm.

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

Richie Wildebrat, a classmate of Mac, constantly boasts about his imaginary friend Blake Superior and their chances of winning a talent show. Wanting to stop the bragging, Mac asks Bloo to enter, but Bloo refuses until he develops hiccups and is mocked by Blake, prompting him to compete.

Mac and Bloo ask Mr. Herriman to go camping, but he initially refuses until Madame Foster approves. After arriving, Bloo eats all the food, prompting Mr. Herriman to venture into the woods in search of more, where he encounters wild rabbits. Meanwhile, the others face their own mishaps: Madame Foster fights a bear, Wilt gets stuck in quicksand, Coco goes fishing, and Mac, Bloo, and Eduardo get lost in the woods.

Goofball John McGee arrives at Foster's and quickly becomes a nuisance. Frankie suspects he is actually a teenager pretending to be an imaginary friend, citing his constant need for help and freeloading behavior. While the others accept him, Frankie becomes determined to prove he is a fraud.

Foster's finally gets rid of Duchess when she is adopted, but her new family turns out to be Mac's neighbors. Her constant complaining soon becomes too much for Mac's mother, who considers moving. Mac and Bloo attempt to frame Duchess to have her returned, but only make her more beloved. When they try to bring her back themselves, Terrence warns the house residents, who try to stop her from re-entering. Ultimately, Terrence's plan fails when the residents learn Mac might move and agree to take Duchess back.

Mac wins a sweepstakes and receives tickets to Europe, but when the gang tries to pack at the last minute, a series of delays slows them down. Meanwhile, Frankie prepares Madame Foster to run the house in their absence.

Mac meets a girl named Goo after falling on her while retrieving a bobsled from a tree. She begins visiting Foster's daily, using her hyperactive imagination to create numerous imaginary friends, quickly overcrowding the house. As a result, the others are forced to sleep on the Foster's bus and begin to blame Mac for Goo's constant visits.

Mr. Herriman's carrot addiction leads him to blame Coco for stealing carrots meant for dinner, though he is actually responsible for hiding them. With no carrots left, Frankie is forced to prepare "It," an unappetizing dish Bloo is determined to avoid. Meanwhile, Mr. Herriman punishes anyone near his hidden carrots, and Bloo repeatedly tries to get in trouble to skip dinner, only to be overlooked as chaos spreads throughout the house.

Eduardo gets fleas from his puppy and is driven mad by the itching. However, he grows attached to them and refuses to get rid of them, while Frankie and Mr. Herriman take drastic measures to remove the infestation. Meanwhile, Bloo tries to get fleas of his own and repeatedly attempts to convince Eduardo to share them.

When various imaginary Santa Clauses arrive at Foster's, Mac begins to lose his belief in Santa Claus. Bloo and the others attempt to restore his faith through a series of misguided plans, including sending Wilt on a global sleigh ride and having Eduardo try to use the chimney. Their efforts backfire, causing widespread chaos—Wilt is lost, Eduardo gets stuck, Coco loses her job as a mall Santa, and Mr. Herriman throws away the holiday decorations. The group must find a way to save the holiday before it is ruined.

Mac makes a home movie about Foster's for a school project, but Bloo edits it into a crude comedy filled with flatulent sound effects, earning it a spot in a student film festival. With Bloo's help, they create a new film, but Eduardo accidentally tapes over it with his favorite educational program, costing them the contest.

Tired of Mr. Herriman's strict rules, Frankie runs for president of the house. Bloo also enters the race but later drops out, helping Herriman by spreading embarrassing, even false, claims about Frankie. Frankie ultimately wins, leaving Herriman jobless.

When an adoption leaves a room vacant at Foster's, Bloo, Coco, Wilt, and Eduardo compete for it, along with another friend named Peanut Butter. Their rivalry escalates into a series of contests, many of which Bloo attempts to rig in his favor.

During a school field trip to Foster's, Coco becomes popular when she lays eggs containing imaginary friend trading cards. As everyone begins collecting them, Bloo grows obsessed with obtaining a complete set.

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, Imaginary Man's mortal enemy, to get revenge on Mac.

The residents of Foster's prepare for the annual house photo. Meanwhile, Eduardo gets an "extreme makeover" from Duchess, Coco thinks that she needs to lose weight, Wilt has trouble being in the house photo without getting his head cut out of the frame, and Mac and Bloo search for an answer behind a strange photo taken of the friends many years ago.

Bloo wakes up to find the house completely deserted. With no Herriman or Frankie there to enforce the house rules, Mac and Bloo set out to cram as much fun and mischief into one day as they possibly can.

On Adopt-a-Thought Saturday, Madame 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.

Bloo and the gang arrive at Mac's apartment for a slumber party that Mac did not plan. Mac tries desperately to keep his friends quiet before they wake up his mom and brother with their shenanigans.

Mac suspects that Bloo, along with the rest of the house, are planning him a surprise party. Mac, however, wants no part of it, since Bloo's surprise parties always humiliate him in some way, and he is determined to foil Bloo's plans by any means necessary.

Bloo notices after a trip to the grocery store that Frankie has left the keys in the bus and decides to take Mac for a joyride in the Foster's bus. Wilt, Coco, and Goo promise to keep it a secret, much to Wilt's disconcern.

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 house and nobody knows the password except for Cheese, who memorized the code as a song.

Bloo is tired of Madame Foster getting all the glory for rescuing abandoned friends, so he sets up his own foster home - Bloo's Foster's Home for Imaginary Friends - in a cardboard box on the sidewalk.

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 namesake when he cons Madame Foster and starts selling the friends for profit.

When a thunderstorm knocks out the power at Foster's, the gang organizes a game of pretend. Goo - who pretends to be an international pop star - gets upset when the boys do not want to play with her, so she make-believes a gang of villains that will force them to listen to her imaginary concert. In her sleep, Goo accidentally makes all her villains come alive. Now, she must finish the game to save her friends from her own creations.

In this double-length special, the Five-Year Creator Reunion Picnic takes place, 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 letdown, sets off on a cross-country journey to rectify the situation. Meanwhile, Mac, Bloo, and Frankie, along with Eduardo and his creator, Officer Nina Valerosa, and Coco, along with the two scientists who discovered her, set out to find Wilt and bring him back home.

Bloo is suddenly convinced that Cheese is an alien spy working for an evil extraterrestrial organization to remove brains of people on earth and cause an alien invasion after watching a science fiction movie and reading a tabloid newspaper where pictures are similar to Cheese. Later on, Frankie and everyone else (including Bloo) are stuck in an out of control day of errands and priorities, which causes utter bedlam when Cheese screams "gotta go" hundreds of times and Bloo uses the observatory intercom to communicate with aliens from outer space.

The gang goes to a swap meet where a pick-pocket is stealing money. When the thief accidentally loses a $100 bill, Eduardo finds it and takes his money around the swap meet looking for something to buy. Even the most sensible of the gang are tempted by the bill, and with the thief also trying to catch his money, chaos ensues.

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 Bloo that does not seem to end, causing him to take big measures to try to get out of it.

Bloo visits a retirement home and 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.

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 (Herriman), who is taking away all the fun in the land ruled by the Queen (Madame Foster). The story, Mac finds out, is a complete exaggeration of the day's events at Foster's.

A rock and roll band called Pizza Party, formed by a group of imaginary friends, annoy Bloo by not allowing him to be their lead singer, so he decides to form his own band with Wilt, Eduardo, and Coco called Taco Fiesta. Soon, they are challenged to a "Battle of the Bands".

Bloo overhears Mac talking about his supposed wedding. Dismayed, Bloo finds help from a depressed imaginary friend, not wanting to lose Mac forever. Bloo observes some adults and mimics them to try to grow up for Mac.

A rich kid named Barry Bling comes to Foster's, and Mac and Bloo introduce him to all of the imaginary friends. After seeing all of the friends, Barry wishes to adopt Bloo, but Mac tells him that Bloo is not up for adoption. Bloo, however, begins sneaking over to Barry's house in order to play with his automatic paddle ball machine. When Mac goes to pick up Bloo, he soon finds out the shocking truth about Barry.

Bloo, Frankie, and Madame Foster are tangled up in a chaotic series of events when Frankie wins tickets to the premiere of a new action movie starring Rod Tango.

Bloo tries the old peanut brittle can filled with snakes trick, thinking it as the ultimate Halloween prank after strapping Mac to his bed, thus not allowing him to go trick-or-treating because of his regular sugar rushes. However, when Mr. Herriman tries it, Bloo thinks it has gone awry, and Herriman becomes a zombie, with the others also becoming undead later on through the episode. However, everyone was just pretending to be zombies and it was a prank set up for Bloo.

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.

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

A plan to have Mr. Herriman mellow out backfires as conditions at the home start to deteriorate.

Mac seeks the aid of Jackie Khones to find out who stole his library card and used it to check out a now-overdue book.

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

A termite infestation at Foster's forces Mr. Herriman to move the Friends into a hotel for the night. While at the hotel, Bloo, being rambunctious, gets out of hand, disobeying all of Mr. Herriman's rules. To get rid of him, Wilt, Eduardo, and Coco play a prank on Bloo, though Mr. Herriman believes Bloo did it. Bloo, angry at Coco, challenges her to a prank war, turning the night into an outrageous chain of pranks.

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.

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.

Frankie is tired of working without being thanked. One day, a toy box is discovered at Foster's front door. Frankie is ordered to take it to the attic and leave it alone, but she knows there is an imaginary friend trapped inside, and opens the box to find it. When she looks inside, she falls into a strange imaginary world. There, she gets treated like a princess by a mysterious imaginary friend, World (as named by the crew). After tackling certain bizarre toy box trials and tribulations, Bloo, Mac, Wilt, Eduardo, and Coco discover Frankie's whereabouts and set out to rescue her from this strange world.

In the sequel to "The Bloo Superdude and the Magic Potato of Power!", Bloo must set out on a quest if he wishes to attend a ceremony honoring The Great Creator of Everything (Mac). In reality, Bloo is sick, delirious and hallucinating, making him think he is the Superdude when he is only running around the house trying to get and Mac's birthday party outside.

A little dare between Mac and Bloo turns into a huge daring competition between the house members once Madame Foster gets involved.

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 another Adopt-a-Thought Saturday.

Frankie and Mr. Herriman are hosting an important party in the foyer to raise funds for the house, so Frankie tells Bloo, Wilt, Eduardo, and Coco to either stay upstairs or outside. After a series of ridiculous deciding, they choose to stay upstairs, but after being there for a while, they get bored and decide to go outside. Nothing bad happens until Mac comes with video games and they realize they are stuck outside. The situation becomes chaotic as they try to get inside and end up ruining things for Mr. Herriman and Frankie.

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 time the clock announces the hour. However, to everyone's surprise and relief (and Mr. Herriman realizes he forgot to mention this), it turns out Mac is moving to an apartment just next door that was held by Louise's family. On a less happy tone for everyone at Foster's, Cheese ends up moving in because Louise's new home does not allow imaginary friends. The show ends with the house slowly being erased as the beginning of the show's theme song plays in reverse. Cheese then says a final goodbye to the audience, ending the series.