When he left Fox, Dillman mostly concentrated on television. He co-starred with Barbara Barrie on The Alfred Hitchcock Hour in the episode "Isabel" (1964) and with Peter Graves in Court Martial (1966). He guest-starred on series such as Ironside, Shane, The Name of the Game, Columbo, Wild Wild West, The Eleventh Hour, Wagon Train, The Greatest Show on Earth, Breaking Point, Mission Impossible, The Mary Tyler Moore Show, Barnaby Jones and Three for the Road, and a two part episode of The Man From U.N.C.L.E., which was made into the feature film The Helicopter Spies (1968).