Season 6 has already nabbed both Colin Hanks and actor/rapper Mos Def and now Showtime just announced that Emmy and Golden Globe Award winning actor Edward James Olmos (Battlestar Galactica, American Me) has joined the upcoming season for a major story arc.

Olmos will play a "brilliant, charismatic professor of religious studies" – which fits with this season's "Hell Breaks Loose" tagline and the fact that Colin Hanks plays an expert on ancient artifacts linked to a series of murders. We don't know if Olmos will be this season's "big bad," but I think it's safe to say he'll probably get close to discovering the truth about Dexter and then definitely, definitely get conveniently bumped off by the finale.