Christian Slater became the poster child of angst-ridden, outsider teens by starring as mobilizing rebels in “Heathers” (1989) and “Pump Up the Volume” (1990), both of which painted a dark portrait of high school hierarchy. Slater’s screen persona as a handsome and insightful but gun-toting scofflaw – complete with Jack Nicholson mannerisms – played out well in films like “True Romance” (1993), but by then it was glaringly apparent that Slater’s “act” was no act. He segued into adult roles with moody dramas like “Interview with a Vampire” (1994) but repeated arrests and multiple trips to