When Mac accidentally imagines another friend, Bloo suffers sibling rivalry with the newly arrived and very odd Cheese.

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. 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. This is the first and only episode to have a TV-PG rating.

A prank gone wrong has Bloo trying to outrun an army of zombies.

The friends have a house-wide dare competition that quickly gets out of hand.

Bloo feels torn between Mac and a new student, who is the heir to a paddleball franchise.

Recently adopted friends write worrisome letters describing life outside Foster's walls.

Eduardo finds a $100 bill on the ground at a swap meet, which triggers greed at the Foster house.

Bloo decides to move into a nursing home after an enjoyable visit there.

Bloo entertains Mac with an action-packed story.

Bloo and Mac compete in a 30-mile race.

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. 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. This is the first and only episode to have a TV-PG rating.

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

Bloo creates the greatest rock act ever when some Imaginary Friends start a garage band and won't let him in.

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

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

Coco escapes from Foster's and has a wild adventure.

The Friends start a prank war while staying at a hotel.

The gang posts videos on the Internet after a field trip is rained out.

Bloo's plan to hurry to the county fair backfires when a shortcut with Madame Foster turns into a trip to the fabric store.

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. 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. This is the first and only episode to have a TV-PG rating.

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

Tickets won in a radio contest cause a rift between Mac, Bloo and Frankie.

Bloo wants to grow up because he thinks Mac is engaged.

Eduardo must cover his tracks after telling the nursery residents fibs that could catch up to him.

Bloo sees a sci-fi movie about extraterrestrials that look like Cheese, so he thinks that Cheese is a brain-sucking alien.