...that's the basic plot of 1992's "Poison Ivy" starring Drew Barrymore in the titular role. The movie comes from a long tradition of films about an alluring babysitter (or nanny or friend) taking control of the family by winning the hearts of the kids and seducing the husband. "The Babysitter" (1980) and "Summer Girl" (1983) are two examples, both TV flicks (available on youtube). In "Poison Ivy" Drew, as Ivy, plays a friend of the awkward misfit Sylvie (Sara Gilbert). Tom Skerritt plays the aloof husband and Cheryl Ladd the withering (but st... read the rest.