Stiefmutter – Stiefmonster

Stepmonster is a 1993 American comedy horror film directed by Jeremy Stanford, executive produced by Roger Corman, and starring Alan Thicke, Robin Riker, George Gaynes, Ami Dolenz, Corey Feldman, Edie McClurg, John Astin, and Billy Corben. It was a direct-to-video film. After its release, it was sometimes aired on The Disney Channel.

In the film, a boy's mother is kidnapped by a shapeshifting monster, called a tropopkin. The woman is declared missing, and her husband presumes that she has died. He is not particularly concerned, as he is engaged to marry another woman. The woman in question is the shapeshifting tropopkin, and plans to kill him during the next summer solstice. Her prospective stepson witnesses her killing various victims, and tries to expose her real identity.