The secret?  S-h-h, don’t tell anyone but Bruce plays a dual role in this film.  The “archvillain” is also played by Bruce. He is slightly less emotionally challenged than Mr. Blue.  He smiles (wickedly) and sneers (a lot).  The photos below of Bruce in the gray suit are the “archvillain.”

The second secret?  Mr. Blue’s first name is revealed in the first part of the film. It’s Martin.  Gee, wonder where they got that name?