When does Welcome Back, Kotter return?

Welcome Back, Kotter is an American sitcom starring Gabe Kaplan as a high-school teacher in charge of a racially and ethnically diverse remedial education class called the "Sweathogs" Recorded in front of a live studio audience, the series aired on ABC from September 9, 1975, through May 17, 1979. It provided John Travolta with his breakthrough role.
The show stars stand-up comedian and actor Gabriel "Gabe" Kaplan as the main character, Gabe Kotter. Kotter returns to his alma mater, James Buchanan High School in Bensonhurst, Brooklyn, ten years after graduating to teach a remedial class of loafers, the Sweathogs. Many of the show's characters were also based on people Kaplan knew during his teen years.