Along with Michael Ansara, Kevin Hagen, Torin Thatcher, John Crawford, Malachi Throne and Bart La Rue, he is one of only seven actors to appear in all four of Irwin Allen's science fiction series: Voyage to the Bottom of the Sea (1964), Lost in Space (1965), The Time Tunnel (1966) and Land of the Giants (1968). Of these actors, he was the last survivor.