Stallone and the other "Expendables" producers reportedly originally intended to get Trejo on board for the first film, and his exclusion seemed like a lost opportunity. Perhaps it's time to set things right and bring him in for the threequel. Unique on this list, Trejo didn't become an action hero until later in life, eventually building a cult following by appearing in a number of Robert Rodriguez's genre hits, including "Desperado," "Machete" (pictured) and its upcoming sequel.

-Dave Lewis