House of Bloos: A boy named Mac brings his imaginary friend Bloo to a house where imaginary friends go when they are abandoned or outgrown.
Store Wars: The friends have a series of misadventures at the mall while out buying Madame Foster a birthday present.
The Trouble with Scribbles: Bloo unlocks a door that hides away millions of tiny, scribbly friends.
Busted: Bloo fears retribution from Mr. Herriman after he accidentally breaks a bust of Madame Foster.
Dinner is Swerved: Mac and Bloo try to find their way to the dining room through the maze of a house, while the friends stave due to Herriman's insistence not to eat until the two arrive.
World Wide Wabbit: Bloo secretly tapes a performance by Mr. Herriman and it soon goes viral.
Berry Scary: A new friend named Berry moves in and developed a dangerous crush on Bloo.
Seeing Red / Phone Home: Terrence creates an imaginary friend to crush Bloo; Bloo tries to find an imaginary friend to bring to the house and picks up a man in a mascot suit.
Who Let the Dogs In?: Eduardo finds a box of puppies and tries to hide them due to Mr. Herriman's rule against dogs in the house.
Adoptcalypse Now: Mac and Bloo try to save their friends from getting adopted on Adopt-a-Thought Saturday.
Bloooo: Bloo gets a cold and turns white as a sheet, causing his friend to think that he's a ghost. Meanwhile, Frankie is locked out of the house in the rain and is apparently being perused by a strange character.
Partying is Such Sweet Soiree: Bloo gets Herriman out of the house to throw a wild party, but it all goes south when Mac consumes some sugar.
The Big Lablooski: Madame Foster and the friends go to the bowling alley to compete in a tournament against her rival.
Where There's a Wilt, There's a Way / Everyone Knows It's Bendy: Wilt's inability to say "No" causes him to miss a basketball game; a mischievous new friend moves in a frames the others for his pranks.
Sight for Sore Eyes / Bloo's Brothers: The friends try to find the owner of a multi-eyed friend named Ivan; Mac brings Bloo to show-and-tell, leading his classmates to create their own Bloos.
Cookie Dough: Bloo decides to make a profit off of Madame Foster's famous cookies.
Frankie My Dear: Frankie is dating, but Mac and Bloo believe she's making a big mistake.
Mac Daddy: Mac believes that he created a new imaginary friend named Cheese in his sleep, which makes Bloo jealous.
Squeakerboxxx: The friends try to share a pink toy elephant that squeaks.
Beat with a Schtick: Bloo fears for his life when he earns the wrath of a large, intimidating friend that he insulted.
The Sweet Stench of Success: Bloo signs a contract to be a television star, but he finds out that success isn't all that it seems.
Bye Bye Nerdy: Bloo fears Mac is becoming a nerd and tries to make him a cool kid.
Bloo Done It: When a famous imaginary friend returns, Bloo gets jealous and thinks he's up to something.
My So-Called Wife: Mr. Herriman trains Coco to pretend to be his wife so the house can get a generous donation.
Eddie Monster: When Eduardo runs away, Terrence finds him and gets him into a imaginary friend fighting ring.
Hiccy Burp: Bloo tries to find a talent to upstage a cooler imaginary friend.
Camp Keep a Good Mac Down: What mac wants to be a tranquil camping trip quickly turns to disaster.
Imposter's Home for um...Make 'Em Up Pals: A lost friend moves in, but Frankie believes he's a phony.
Duchess of Wails: Duchess finally gets adopted — by Mac's next-door neighbors, and she proceeds to drive him crazy with her shouting, prompting him and Bloo to try and bring her back to the house.
Foster's Goes to Europe: Mac wins a trip to Europe and invites his friends to go with him. The only problem is packing up.
Go Goo Go: Mac meets a talkative girl named Goo who overwhelms the house with her imaginary friends.
Crime After Crime: Mr. Herriman's efforts to conceal his theft of carrots sets off a wacky chain of events.
Land of the Flea: Eduardo fur gets infested with a bunch of friendly fleas.
A Lost Claus: In this Christmas Special, Mac questions his belief in Santa Claus after a horde of imaginary Santas move into the house.
One False Movie: Bloo helps Mac make a movie when his edit of Mac's documentary on the house impresses his principal.
Setting a President: Frankie campaigns against Herriman for the position of house manager.
Room with a Feud: Bloo, Wilt, Eduardo and Coco compete to claim ownership a vacant room in the house.
Cuckoo for Coco Cards: Coco creates trading cards of the friends, and Bloo becomes obsessed with collecting them all.
Challenge of the Super Friends: After Mac befriends a superhero imaginary friend and becomes his sidekick, Bloo gets jealous and teams with the hero's enemy.
The Big Picture: Mac and Bloo try to solve a mystery regarding a photo from a past house Picture Day where everyone seemed to disappear.
Squeeze the Day: Having been left behind at the house while the others go to the beach, Bloo and Mac try to have the best day ever with the house to themselves.
Neighbor Pains: Bloo wages war on the neighbors, Old Man Rivers and his grandson, who hate imaginary friends.
Infernal Slumber: Bloo and the friends arrive at Mac's apartment late at night for a slumber party.
I Only Have Surprise for You: Mac tries to stop Bloo from throwing a birthday party for him in fear of getting humiliated by him like always.
Bus the Two of Us: Bloo takes mac on a joyride in the house bus and get lost.
The Big Cheese: Mr. Herriman accidentally locks everyone outside with the house's new security system, and only Cheese knows the code to unlock the door.
Bloo's the Boss: Bloo tries to start his own home for imaginary friends.
Emancipation Complication: Madame Foster sells the house to an imaginary friend who sells the friends to work for people.
Make Believe it or Not: Goo accidentally creates a group of villainous imaginaries in her sleep.
Good Wilt Hunting: In the show's first TV movie, Wilt runs away and goes on a cross-country journey to find his creator.
Cheese a Go-Go: Bloo becomes convinced that Cheese is really an alien (Part of the Cartoon Network Invaded miniseries).
The Buck Swaps Here: The friends go to a swap meet.
Say It Isn't Sew: Bloo's plans to go to a fair take a long detour when Madame Foster stops at a place to get her torn coat sewn together.
Something Old, Something Bloo: When the friends visit a retirement home, Bloo becomes enamored in the elderly lifestyle.
The Bloo Superdude and the Magic Potato of Power!: Bloo tells Mac a fantastic story with himself inthe leading role.
Schlock Star: When a group of friends won't let Bloo join their band, he decides to start his own.
The Bride to Beat: Bloo mistakenly believes that Mac is getting married.
Affair Weather Friends: Mac becomes depressed when it appears that Bloo is hanging out with another kid behind his back.
Ticket to Rod: Mac, Bloo and Frankie fight over movie premiere tickets Bloo won on the radio.