S03E15 - The Horror of Slumber Party Mountain
Synopsis
Elmyra, dressed up as Elvira, tells the story about an evil bunny who wants revenge when ridicule drives him to his death. Buster, Babs, Plucky, Hamton, Fifi, and Shirley are having a sleep-out in that same area where the monster hangs out. They are playing practical jokes on one another, but the jokes start to get really scary when they start disappearing one by one. Buster is the last one left, but he is caught and captured. The monster uncovers itself as Elmyra!