Actor, and Comedian. He is best remembered for his role of 'Robinson Peepers' in television sitcom "Mr. Peepers" (1952 to 1957) and for his voice characterization of the animated superhero, 'Underdog', whose most famous line was "There's no need to fear! Underdog is here!" 'Underdog' was uniquely known for always speaking in rhyme. Born in Detroit, Michigan, he became an actor of surprising range of roles, but it was in comedy that he was most famous. His slight frame, small stature, and horned rim glasses made him the perfect meek, shy, mousey character that was often overlooked by society, for which many in the audience could identify. During the 1940s, he studied acting with Stella Adler, and roomed many years with beginning actor Marlon Brando. Cox would later move out of their shared apartment supposedly because he could not stand Brando's pet raccoon, yet they remained lifelong friends. His first serious television role came with "School House" (1949), but it was his next role as "Mr. Peepers" in the television series of the same name that he is often most fondly remembered. He had some success as the hero in the television series, "The Adventures of Hiram Holliday" (1956) and he moved into movie roles with "State Fair" (1962) and "Spencer's Mountain" (1964). His serious side was evident in his supporting role of Seaman Merlin Queffle in "The Bedford Incident" (1965) and in "Morituri" (1965). Despite his meek and mild appearance, again underscored by his voice characterizations of the animated cartoon show, "Underdog" (1964 to 1967), his hobby was motorcycle riding and racing. In his later years, he was a frequent guest on the television game show, Hollywood Squares. Married twice: first to Marilyn Gennaro and later to actress Patricia Tiernan, he died in 1973 in Bel Air, Los Angeles, California of a sudden heart attack.