Gabe Kaplan Gabe Kotter Actor Marcia Strassman Julie Kotter Actor John Sylvester White Mr. Michael Woodman Actor Robert Hegyes Juan Epstein Actor Lawrence-Hilton Jacobs Freddie "Boom Boom" Washington Actor Ron Palillo Arnold Horshack Actor John Travolta Vinnie Barbarino Actor Susan Pratt Guest Star Kristine Greco Guest Star James Komack Executive Producer Eric Cohen Producer George Yanok Producer, Writer Bob LaHendro Director