A boy and his beloved imaginary friend are able to stay together at an orphanage of sorts for imaginary friends that children have outgrown to be adopted by new children.

Sometimes imaginary friends get lost or kids outgrow them and that's why Madame Foster started Foster's Home for Imaginary Friends. When kids dream up pals, they come to life and the house is filled with diverse characters waiting to be reunited or adopted to new kids. The series focuses on building friendships and the importance of friends.

Eight-year-old Mac has outgrown his imaginary friend, says his mother, so he takes his buddy Bloo (a walking, talking security blanket) to Foster's Home for Imaginary Friends. Here all sorts of odd characters, given up by their creators, are welcome to stay until new kids come to adopt them. Mac strikes a deal with Madame Foster, the proprietor: as long as he comes to visit every day, Bloo will not be put up for adoption.—Alan Back

A creative eight-year-old boy named Mac's imaginary friend, Blooregard Q. Kazoo, is forced to move out of the house, and moves to a foster's home, which literally IS "Foster's Home." Only they don't take regular people. They take imaginary friends. In this house, all imaginary friends, especially Bloo, run wild, doing the most insane things in the most insane behavior. Bloo and his three friends/roommates, Wilt, Eduardo and Coco, are probably the craziest imaginary friends in the house, getting in the most trouble. Even so, they're always forgiven. It's all part of making fellow imaginary friends feel welcome there, right?—wazzup364