It's still unclear who will emerge as the main villain on season six of Dexter. Some say Colin Hanks, others surmise it will be Edward James Olmos.

But one thing is now certain: he or she will face a Dexter Morgan who is renewed, recharged and refocused.

So he says himself in the following trailer for new episodes, which will air on Showtime in the fall. What will it mean that Dexter is feeling like his old self again? We can't wait to find out.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.