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 Ellen Travolta Guest Star Vernee Watson Guest Star Charles Fleischer Guest Star John Astin Guest Star Scott Brady Guest Star Ned Wertimer Guest Star Michael V. Gazzo Guest Star Kristine Greco Guest Star Helaine Lembeck Guest Star Dennis Bowen Guest Star Elyssa Davalos Guest Star Dennis Palumbo Guest Star Chanin Hale Guest Star James Komack Executive Producer, Director George Yanok Producer, Writer Jerry Rannow Producer, Writer Eric Cohen Producer, Writer Jewel Jaffe Rannow Producer, Writer Bob LaHendro Director Raymond Siller Writer Bob Shayne Writer Peter Meyerson Writer George Tricker Writer Bill Hobin Director Ira Miller Writer Bill Persky Director Nick Arnold Writer Neil Rosen Writer