Some people just aren’t meant to stay on series in which they play one of the main characters. Wait what? That only happens to Charlie Sheen… oh yeah, and Shannen Doherty. This notorious on-set bad girl couldn’t keep her grasp as Brenda on 'Beverly Hills, 90210' or as one of the three original sisters on her “mature” series, Charmed. (Rose McGowan says, “Thanks” by the way.) Apparently, Shannen just can’t play well with others.