Following the Kubrick film, Leith signed a contract with 20th Century-Fox and had leading roles in "Violent Saturday" (1955), "On the Threshold of Space" (1956), "Toward the Unknown" (1956) and "A Kiss Before Dying" (1956).
Leith completed the feature "The Black Door" (1955), but it wouldn't be released until 1962, under the title "The Brain That Wouldn't Die".
"...'Dr. Bill Cortner' (Jason Evers) saves a patient who had been pronounced dead, but the senior surgeon, Cortner's father (Bruce Brighton), condemns his son's unorthodox methods and transplant theories.
"While driving to his family's country house, Cortner and his beautiful fiancée 'Jan Compton' (Leith) get into a car accident that decapitates Jan. Cortner recovers her severed head and rushes to his country house basement laboratory. He and his crippled assistant 'Kurt' (Anthony La Penna