Heathers
A girl who halfheartedly tries to be part of the "in crowd" of her school meets a rebel who teaches her a more devious way to play social politics: by killing the popular kids.
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About
Heathers (1989) is a comedy, crime movie running 1h 43m. Starring Winona Ryder, Christian Slater, Shannen Doherty. Rated 7.3/10 on TMDB. Watch it online free on ZapFlix.