Jack Cassidy co-starred in an episode of the ABC Comedy Hour with the man who played Duke Slater in "Gomer Pyle, U.S.M.C..
The ABC Comedy Hour was an American television variety series that aired on ABC in 1972. 
 The remaining six episodes were variety specials and included two Friars Club roasts and a revival of the musical "Hellzapoppin'" starring Jack Cassidy and Ronnie Schell. 
Ronald Ralph "Ronnie" Schell (born December 23, 1931) is an American actor, stand-up comedian, and voice actor. 
 Schell is probably best known in his 1960s television role as Duke Slater in "Gomer Pyle, U.S.M.C." 
