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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 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.

The friends have to make their own fun when rain forces them to cancel a trip to a water park. They decide to upload videos to ViewTube, while Bloo, sulking because of their cancelled trip, tries to ruin everyone's fun.

Bloo becomes tired of always losing to Mac at everything, so one day at the Prize Hive, he challenges Mac to a 30-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.

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 the strange world.

Frankie, Mac, Bloo, Mr. Herriman, Wilt, Eduardo and Coco must find a way to escape the mysterious realm of an imaginary friend.

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

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

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 the latest Adopt-a-Thought Saturday.

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

When Mr. Herriman tells Bloo that Mac is moving, Bloo decides to give him the best day ever, though things do not go as he plans. All day, Mac does things with everyone but Bloo, making him angrier after every disappointment.