Itchy & Scratchy
When network executives decided that The Itchy and Scratchy Show needed an "update" to keep the interest of its audience, they devised Poochie, a cartoon dog "with an attitude". After widespread auditions, Homer was chosen to provide Poochie's voice. The character debuted to an unreceptive audience following a massive publicity campaign; he only served to interfere with the well-oiled machine of hyperviolent slapstick that Itchy and Scratchy had perfected over the years. When dissatisfied viewers flooded the network with letters crying for Poochie's immediate removal, if not death, the executives quickly decided to get rid of the character. Homer begged for another chance, insisting that Poochie would grow on the audience; this argument held little weight until the actress who performed voices for both Itchy and Scratchy declared her support for Poochie as well. Homer was shocked, however, when the next cartoon aired: it contained a hastily-animated, retroscripted segment stating that Poochie had decided to return to his "home planet", and that he died when his spaceship crashed.
He has since been seen once in a cameo at a funeral in an Itchy & Scratchy cartoon. Also in "Treehouse of Horror IX", he skateboards in the road and gets ran over by Scratchy. He also continues to be released in Itchy & Scratchy related merchandise.