John Travolta in Welcome Back, Kotter (1975)

Ron Palillo in Welcome Back, Kotter (1975)

Gabe Kaplan in Welcome Back, Kotter (1975)

John Sylvester White in Welcome Back, Kotter (1975)

John Travolta, Robert Hegyes, Lawrence Hilton-Jacobs, Gabe Kaplan, and Ron Palillo in Welcome Back, Kotter (1975)

Marcia Strassman in Welcome Back, Kotter (1975)

John Travolta, Robert Hegyes, Lawrence Hilton-Jacobs, and Ron Palillo in Welcome Back, Kotter (1975)

"Welcome Back Kotter" Laurence Hilton-Jacobs

Debralee Scott in Welcome Back, Kotter (1975)

Gabe Kaplan and Debralee Scott in Welcome Back, Kotter (1975)

"Welcome Back Kotter" Robert Hegyes, Gabe Kaplan 1976 ABC

"Welcome Back Kotter" Robert Hegyes 1976 ABC

Groucho Marx and Gabe Kaplan in Welcome Back, Kotter (1975)

Groucho Marx, John Travolta, Robert Hegyes, Lawrence Hilton-Jacobs, Gabe Kaplan, Ron Palillo, Marcia Strassman, and John Sylvester White in Welcome Back, Kotter (1975)

John Travolta and Lawrence Hilton-Jacobs in Welcome Back, Kotter (1975)

Robert Hegyes, Lawrence Hilton-Jacobs, Ron Palillo, and Stephen Shortridge in Welcome Back, Kotter (1975)

Marcia Strassman and John Sylvester White in Welcome Back, Kotter (1975)

Charles Fleischer, Bob Harcum, and Robert Hegyes in Welcome Back, Kotter (1975)

Rachel Levario in Welcome Back, Kotter (1975)

Melonie Haller, Robert Hegyes, and Lawrence Hilton-Jacobs in Welcome Back, Kotter (1975)

John Travolta and Robert Hegyes in Welcome Back, Kotter (1975)

Lawrence Hilton-Jacobs, Gabe Kaplan, Ron Palillo, Marcia Strassman, and John Sylvester White in Welcome Back, Kotter (1975)

Robert Hegyes in Welcome Back, Kotter (1975)

Lawrence Hilton-Jacobs in Welcome Back, Kotter (1975)

Suze Lanier-Bramlett, John Travolta, Ron Palillo, Lawrence Hilton Jacobs, Robert Hedges