Which TV series introduced the star who was paired with Robert De Niro in the film Killing Season ?
Killing Season (film): Killing Season (previously titled Shrapnel) is a 2013 American action thriller film written by Evan Daugherty and directed by Mark Steven Johnson for Millennium Films, as the first on-screen pairing of actors John Travolta and Robert De Niro. 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).
Welcome Back, Kotter