His first screen role was as the Harmonica Man in "The Purple Testament", an episode of The Twilight Zone in 1960. Masak appeared as "Mike the boxer" on "The Flying Nun", season 1, episode 26 ("Where There's a Will"), which first aired March 13, 1968. Masak appeared as "Officer #2" on Bewitched, Season 7, Episode 4 ("Samantha's Hot Bedwarmer"), first aired on October 15, 1970. He also had a guest appearance as Beauregard Jackson in the episode "Hurricane" on Land of the Lost. He appeared in the second season of Barney Miller episode of "The Horse Thief" as officer Shriker, and was a guest star in the "Welcome Home, Vince" episode of The Feather and Father Gang in 1977 and in the episode "The Two-Million-Dollar Stowaway" of The Eddie Capra Mysteries in 1978. In 1981 Masak guest starred on the Magnum, P.I. episode "Skin Deep". He also guest starred in Quincy, M.E.