Get your butcher knives sharpened ... looks like Dexter is getting even more wicked for Season 5! Michael C. Hall, who has successfully battled his real-life bout with cancer, is back with a vengeance as Showtime's favorite serial killer.

In the trailer, looks like Julie Benz, who was killed off in last season's finale, is back ... even if she is neck deep in blood.

Can't wait to watch the new season when it begins on September 27th!