Bone is an imaginary friend who only appears in the episode "Phone Home".
Appearance[]
Bone is an imaginary friend who has the appearance of a typical white cartoon bone with two arms, two legs, and a face.
History[]
At the beginning of "Phone Home", Bone is seen running from a pack of hungry dogs. The dogs eventually corner Bone, but Wilt steps in and rescues Bone and gives the dogs a steak in return. Wilt brings Bone back to Foster's and is congratulated on doing yet another good deed for a friend in need.
Bone never appears in later episodes, but his signature, which is just "Bone", can be seen in the farewell card in "Goodbye to Bloo".