Screenshot from the episode.
"The Horror Of Slumber Party Mountain" is an episode of the animated TV series Tiny Toon Adventures which makes suitable viewing fro Halloween. It first aired in the United States on Fox Kids on November 12, 1992.
Plot
Elmyra, who is dressed up as Elvira, tells the story of a bunny gone evil who wants revenge, after being ridiculed and driven to near death. Buster, Babs, Plucky, Hamton, Fifi and Shirley just so happen to be camping out in the same area where he is. They are playing jokes on each other, but the jokes start to take a serious turn, when they are kidnapped one by one. Buster becomes the last one standing, but he is ultimately captured, and the monster reveals itself as Elmyra.
See also
See the article on The Horror of Slumber Party Mountain on Fandom's Tinytoons wiki.