Question: Phenomenon starred the actor who first became known for being a part of what television show?
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