What happens when a child outgrows his trusty Imaginary Friend, the pal that stuck with him through all of the highs and lows of growing up? Well, these creations pack up and head for Foster's Home for Imaginary Friends! Foster's is a one-of-a-kind Victorian mansion filled with hundreds of unique characters from all over the world, thought up by completely different children for completely different reasons. These creatures all live together in this...

Stranded in a remote desert town, the gang soon discovers the place is crawling with flying-saucer buffs, secretive scientists and less-than-friendly extraterrestrials. Or is it all a front for criminal activity?