Foster's Home for Imaginary Friends - Season 4 - Eps 11: Make-Believe it or Not!
Mac and Bloo are imprisoned by evil characters unwittingly created by Goo in her sleep.
About Foster's Home for Imaginary Friends

Title: Foster's Home for Imaginary Friends
First Air Date: 2004-08-13
Last Air Date: 2009-05-03
Status: Ended
Rating: 7.786/10 (from 476 votes)
Language: EN
Seasons: 7
Total Episodes: 79
Network: Cartoon Network
Genres: Kids, Animation, Family, Sci-Fi & Fantasy, Comedy
Production Companies: Cartoon Network Studios
Synopsis
Children who create imaginary friends usually take care of them until they are 7-8 years old. Imaginary friends, left on their own after this event, continue to live in this home founded by old Madam Foster.
Cast

Sean Marquette
Mac (voice)

Keith Ferguson
Bloo (voice)

Tom Kenny
Eduardo (voice)

Phil LaMarr
Wilt (voice)

Grey DeLisle
Frankie (voice)

Tom Kane
Mr. Herriman (voice)

Candi Milo
Coco / Madame Foster (voice)