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 George Carlin Guest Star Fred Grandy Guest Star Marcie Barkin Guest Star James Komack Executive Producer George Yanok Producer, Writer Bob LaHendro Director Peter Meyerson Writer Nick Arnold Writer