Seth Poppel/Yearbook Library, GREG GAYNE/CBS/LANDOV
Charlie Sheen (Charlie Harper)
Now: Sheen has struggled publicly with addiction on and off for years, and has had more than one run-in with the law because of his drug problem. In March 2011, Sheen began a series of rants attacking the creator of Two and a Half Men, calling costar Cryer a “troll,” and claiming to have tiger blood. He became a tabloid sensation and set a record for most new Twitter followers in a 24-hour period. He was fired from the show and subsequently embarked on a critically panned national tour. Sheen appeared on the 2011 Emmy Awards, surprising everyone when he wished his former costars success with their new season. Sheen now stars on FX's Anger Management.