What's a kid to do when they outgrow their imaginary friend? Drop 'em off at Foster's Home For Imaginary Friends, that's what. And in Season 5, Bloo, Eduardo, Coco, Wilt, Cheese, and all of the other friends and Madame Foster's get into more crazy predicaments than you can shake a made-up stick at - starting with brain-sucking space aliens, and ending with who-knows-what.