Blond, slightly built Scottish juvenile lead of English stage and film in the 1950s and early 60s before moving to Hollywood. McCallum's dreamy eyes and serious, thoughtful demeanor lent credibility to his portrayals of scientists, educators and other brainy types but stardom came when he was cast as the introverted Russian-born superagent Illya Kuriakin in the campy espionage series "The Man From U.N.C.L.E." (NBC, 1964-68). Teamed with the flashier, urbane Napoleon Solo (Robert Vaughn), Mr. Kuriakin worked for United Network Command for Law Enforcement in their never-ending battle to save the