Teacher Gabe Kotter (Gabriel Kaplan) returns to his former high school to teach a group of remedial students known as the Sweathogs – a group Kotter himself helped found as a student. As the lovable losers and delinquents of Buchanan High – including John Travolta in his breakthrough role as Vinnie Barbarino – adjust to their new teacher, they provide a nonstop string of laughs on Welcome Back, Kotter.