After "The Virginian" ended in 1971, McClure was slated to co-star with Bette Davis on a series about a parolee assisting a judge, played by Davis, by doing detective work. The pilot, produced and written by the team of Richard Levinson and William Link, failed to generate interest in the series and was released as a TV movie titled "The Judge and Jake Wyler". McClure made another attempt at a television series during the 1972–1973 season by co-starring on "SEARCH" as a hi-tech investigator, rotating with Anthony Franciosa and Hugh O'Brian, and again in 1975–1976 in "The Barbary Coast", co-starring William Shatner (with whom he'd starred in "The Virginian" episode "The Claim"). He shifted to low-budget science-fiction movies such as "At the Earth's Core", "The Land That Time Forgot", and "The People That Time Forgot", all three based on the novels of Edgar Rice Burroughs. In 1967, he played the Errol Flynn role in a remake of "Against All Flags" titled "The King's Pirate". He was cast in the lead in three adventures: "The Longest Hundred Miles", "The Birdmen", and "State of Division" (also known as "Death Race"). In the 1970s and 1980s, McClure appeared in commercials for Hamms Beer. McClure also appeared as the blonde slave to Jamie Farr's character in the sequel "Cannonball Run II" (1984).