Sassella was a green skinned witch who offered her help to Prime Evil and his Ghostly Horde on Halloween 1986. Using her magical stopwatch, she turned back time and regressed her age to that of a five year old child - while retaining her adult mind. She then promised to do the same to the Ghostbusters (who would also regress mentally to five-year olds) so that Prime Evil and his ghosts could scare them out of wanting to become Ghostbusters when they grew up.