|This article is a stub. Please help Imagination Companions, A Foster's Home for Imaginary Friends Wiki by expanding it, adding pictures, and improving existing text.
Dennis is a yellow blob-like imaginary friend that lives at Foster's.
Dennis made his debut in Adoptcalypse Now. Mac was checking off every imaginary friend to see if they were present after hiding them away to prevent them from being adopted. Dennis makes two more cameos in The Big Picture and the short Badvertisement.