Question: Which TV series introduced the star who was paired with Robert De Niro in the film Killing Season ?
Sentence (from "John Travolta"): Travolta first became known in the 1970s, after appearing on the television series "Welcome Back, Kotter" (1975–1979) and starring in the box office successes "Saturday Night Fever" (1977) and "Grease" (1978).
Relevant evidence: Yes