When he quit Fox, Dillman mostly concentrated on television. He guest-starred in a 1963 episode of "The Virginian", titled: "Echo of Another Day". He co-featured with Diana Hyland in the Alfred Hitchcock Hour episode 'To Catch A Butterfly in Feb.1963, as well as with Barbara Barrie in the 1964 Hitchcock Hour episode 'Isabel'. He appeared in 7 episodes of "Dr. Kildare" (1964–66) and 26 of "Court Martial" (1965–66). He guest-featured in television series such as "The F.B.I." (6 episodes), "Ironside" (2 episodes), "Shane", "The Name of the Game", "Columbo", "Wild Wild West", "The Eleventh Hour", "Wagon Train", "The Greatest Show on Earth", "Breaking Point", "" (2 episodes), "The Mary Tyler Moore Show", "Barnaby Jones" (6 episodes) 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 movie "The Helicopter Spies" (1968).