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Stepmonster   1992         PG-13, 84 min. Genre: Comedy Director: Jeremy Stanford   Cast: Alan Thicke, Molly Cheek, Robin Riker, Ami Dolenz, Corey Feldman, Billy Corben, George Gaynes, Alice Hirson, Frank Novak, John Astin, Bodhi Elfman, Edie McClurg   Todd (Billy Corben) believes his about-to-be stepmother (Robin Riker) is a Trompken (monsters described in the comics) and determines—with the help of his grandfather (Alan Thicke), sister Wendy (Ami Dolenz), and her boyfriend (Corey Feldman)—to keep her out of the family's life.