He was the singing voice of Yogi Bear in the animated film, Hey There, It's Yogi Bear! (1964), on the song "Ven-e, Ven-o, Ven-a". Prior to that, he was the singing voice of his own character "Jimmy Darrock" on an episode of The Flintstones. However the character's dialogue was provided by voice actor Lennie Weinrib. He then achieved success co-starring as impulsive scientist and adventurer Tony Newman on the science fiction series, The Time Tunnel (1966–1967).