Like many leading stage actors, Cullum found limited success in TV and features. He made his film debut as one of Jean Simmons' brothers in "All the Way Home" (1963) and also had a small role as a missionary in "Hawaii" (1966). Cullum relied on his Tennessee roots to play a district attorney in "MARIE: A True Story" (1985) and wrote himself a strong leading role as an eccentric in 1997's "The Secret Life of Algernon," adapted from the Russell H Grennan novel. Cullum's small screen credits include a stint on the NBC soap opera "The Doctors," a supporting role on "The Day After" (ABC, 1983), the highly publicized TV drama of the aftermath of nuclear war, and the short-lived series "Buck James" (ABC, 1987-88), in support of Dennis Weaver. He also made his TV directorial debut with an episode of NBC's "Quantum Leap" in 1990.