Scoop: Dexter Snags Edward James Olmos By Michael Ausiello / May 24 2011, 12:57 PM PDT 21 Battlestar Galactica vet Edward James Olmos has booked a major role on the upcoming sixth season of Dexter, a Showtime rep confirms to TVLine. Olmos will play a brilliant and charismatic professor of religious studies. The actor joins recently announced Season 6 guest stars Colin Hanks and Mos. The news comes a day before Dexter is set to resume production in Los Angeles. If you like TVLine, you'll LOVE our weekly newsletter. Click here to subscribe.