“Like my acting teacher in New York said years ago, ‘If you’re gonna play a part, play a great part.’” That’s what actor Robert Knepper said to me about not one, but two, great parts he has in the new CW series, Cult. Two in One Knepper read via tape for the dual role of cult leader Billy Grimm and actor Roger Reeves while he was on location in Santa Fe for Seal Team Six:  The Raid on Osama Bin