THE CHRONICLES OF RIDDICK
The sequel to the cult sci-fi hit PITCH BLACK, (one of those movies I've seen dozen's of times) sees Vin Diesel enthusiastically returning to his role as Richard B. Riddick.
Making the movie a double treat, though, is the appearance of Karl Urban as Vaako.
Vaako is a Necromonger Commander and loyal to the faith (a faith rather alien to anything we know). He believes in loyalty and only betrays the Lord Marshal after his ever plotting wife convinces him that the Lord Marshal is unworthy of lordship.