After leaving the series due to network interference and exhaustion, Stefano wrote and directed The Ghost of Sierra de Cobre (1964; aka The Haunted), a film utilizing many of the crew responsible for The Outer Limits. The thriller Eye of the Cat (1969) and the comedy Futz (1969) (co-written by Rochelle Owens) were Stefano's last big-screen jobs for many years. Throughout the 1970s, he wrote many television films such as Revenge (1971), A Death of Innocence (1971), Home for the Holidays (1972), Live Again, Die Again (1974), Aloha Means Goodbye (1974) and Snowbeast (1977). Stefano also wrote one episode for the first season of Star Trek: The Next Generation (1988) entitled "Skin of Evil". Stefano was one of the Guests of Honor at the 1974 NY Telefantasy Convention (along with Noel Neill, Jim Danforth and william Tuttle), and spent hours signing autographs for hundreds of Outer Limits fans. At the show, he expressed his surprise that so many people still remembered the series almost a decade after its cancellation.