It's "Adopt-a-Thought Saturday," when imaginary friends can be taken by new families. Mac and Bloo worry that they'll lose all their pals, and take drastic measures to make sure they don't.

Wilt and Eduardo think there's a ghost in the home.

The friends plan a perfect day for Mac, whom they believe is moving away.

Wilt wants to watch basketball on TV, but the others don't. Then a new Imaginary Friend misbehaves at the house and everyone else gets blamed.

A suspicious imaginary friend shows up at the house, and Frankie is out to prove him a fraud.

Mac doesn't want a surprise party.

Mac and the crew win a trip to Europe.

The gang gets locked out of the house by a new security system, so Peas must discover how to open the door.

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

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

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

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

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

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

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

Terrence creates an imaginary friend named Red to beat up Bloo. Then a man in a cellphone costume fools Bloo.

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

Mr. Herriman tries to conceal his carrot addiction, which causes a lot of trouble at Foster's.

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

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

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.

Bloo is suspicious of an old "Friend" of the house, Uncle Pockets, who returns after a long absence.

Chaos ensues when a new imaginary friend is created to cheat on a history test.

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.