During his time on "Dobie Gillis", Denver appeared on the NBC interview program, "Here's Hollywood". In 1963, Denver played his only major dramatic role on television, as a physician (Dr. Paul Garrett) in one episode of "Dr. Kildare", telecast on October 10, 1963; the episode, "If You Can't Believe the Truth ...", also featured Barbara Eden and Ken Berry. Between the end of "Dobie Gillis" and the start of "Gilligan's Island", Denver appeared in an episode of "The Farmer's Daughter" and in the final episode of "The Danny Thomas Show". He also had a one-episode role replacing the actor who played Dudley A. "Dud" Wash, the fiancé of Charlene Darling of the Darlings, on "The Andy Griffith Show" which was aired March 30, 1964. This was done by the network to promote Denver's face and make him more familiar to the viewing audience since "Gilligan's Island" was about to go on air.