A child actor who appeared on such classic TV shows as "Leave It to Beaver" and "My Three Sons" (both ABC) and was the original voice of Johnny Quest in Hanna-Barbera's popular animated series "The Adventures of Johnny Quest" (ABC, 1964-65), Tim Matheson made a smooth transition to adult actor, following some terrific teen turns in the excellent comedy features "Divorce American Style" (1967) and "Yours, Mine and Ours" (1968). Typecast as a cowboy during his four years as a contract player at Universal, he acted in NBC's "The Virginian" and "Bonanza" and later starred opposite Kurt Russell in their own short-lived Western series, "The Quest" (NBC, 1976)....