(written from a Production point of view)
Fletcher Bryant is an actor and occasional stuntman who played one of Khan's henchmen in Star Trek II: The Wrath of Khan. He received no credit for his appearance and was identified by the name tag of his costume which was sold off on the It's A Wrap! sale and auction on eBay. 
Bryant has performed in television series such as Cimarron Strip (1967, with Paul Carr) and Gunsmoke (1967 and 1970, with Paul Fix, Diana Muldaur, Torin Thatcher, and Charles Seel), and performed stunts in films such as The Island (1980, with David Warner and stunts by Erik Cord, Vince Deadrick, Jr., Christopher Doyle, Robert Herron, Hubie Kerns, Dennis Madalone, Ernest Robinson, John Robotham, and Paul Stader).