Foster’s Home for Imaginary Friends Season 4 Episode 11
In her sleep, Goo accidentally creates all the villain characters from a make believe game that she had helped out on while the power was out at the home during a thunderstorm, who then imprison Mac and Bloo at the home. Now, the gang must finish the game to save their friends.
Episode Title: Make-Believe it or Not!
Air Date: 2005-11-17