In the 1966–67 season, Robertson starred in "Scalplock" another television pilot released as a movie that became "Iron Horse", in which his character wins an incomplete railroad line in a poker game and then decides to manage the company. In 1968, he succeeded Robert Taylor as the host of "Death Valley Days", a role formerly held by Stanley Andrews and future U.S. President Ronald W. Reagan. In rebroadcasts, "Death Valley Days" is often known as "Trails West", with Ray Milland in the role of revised host.