Larry Hagman (right) was featured in the 1964 anti-war film "The Cavern," in which a disparate group is trapped in a cave during World War II.
As a youngster, Hagman had gained a reputation for mischief-making as he was bumped from one private school to another. He made a stab at New York theater in the early 1950s, then served in the Air Force from 1952-56 in England.
Hagman returned to acting and found work in the theater and in such TV series as "The U.S. Steel Hour," ''The Defenders" and "Sea Hunt." His first continuing role was as lawyer Ed Gibson on the daytime serial "The Edge of Night" (1961-63).