Buffy the Vampire Slayer and Angel star Charisma Carpenter has been sitting on a dark secret for two decades — but she’s opening up now, alleging in a powerful and painful Twitter post that the creator of both shows, Joss Whedon, harassed her for years when they worked together. The actress wrote that the abuse was targeted to everyone in the cast, but says her situation got significantly worse when she was pregnant while working on the show.