Winchell provided the voices of Sam-I-Am and the unnamed character Sam pesters in "Green Eggs and Ham" from the animated television special "Dr. Seuss on the Loose" in 1973. He played Fleabag on "The Oddball Couple", Fearless Freddy the Shark Hunter on the "Pink Panther" spin-off "Misterjaw" in 1976, as well as a number of one-shot characters in "The Blue Racer" series. In commercials, he voiced the character of Burger Chef for the fast food chain of the same name, the Scrubbing Bubbles for Dow Chemicals and Mr. Owl for Tootsie Roll Pops.