Foster's Home for Imaginary Friends (2004)

S04E11 Make-Believe it or Not!

Mac and Bloo find themselves trapped by mischievous villains that have come to life, all thanks to Goo’s vivid dreams during her slumber. As they navigate this bizarre world filled with these unintended foes, they must devise a clever plan to escape and restore peace. With Goo unaware of her role in this chaos, it’s up to the duo to confront their dreamlike adversaries and figure out a way back home before her dreams take a turn for the worse.