Gabe Kaplan Gabe Kotter Actor, Writer 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 Melonie Haller Guest Star Helaine Lembeck Guest Star Ellen Travolta Guest Star Amy Johnston Guest Star Larry Cooper Guest Star Ernest Harada Guest Star Martin Garner Guest Star Sam Weisman Guest Star Charles Fleischer Guest Star Bob Harcum Guest Star Demetre Phillips Guest Star Bob Michaels Guest Star Sally Hightower Guest Star James Komack Executive Producer Nick Arnold Producer, Writer Bob Claver Director Mel Stewart Writer George Arthur Bloom Producer, Writer, Producer Peter Meyerson Writer Eric Cohen Writer Beverly Bloomberg Writer Kick Rossner Writer Michael Barrie Writer Garry Ferrier Writer Joyce Gittlin Writer Jim Mulholland Writer Bob Silberg Writer Al Schwartz Director Aubrey Tadman Writer