The Ren & Stimpy Show: Season 5, Episode 4
Stimpy's Pet/Ren's Brain (7 Oct. 1995)
Ren and Stimpy find an abandoned circus clown at their doorstep. While Ren DOES NOT want to keep him, Stimpy pleads and begs until Ren agrees. Ren's status as Lord of the Manor is challenged.Stimpy the mad scientist replaces Ren's brain.