Henry Winkler Arthur "Fonzie" Fonzarelli Actor Tom Bosley Howard Cunningham Actor Marion Ross Marion Cunningham Actor Anson Williams Warren "Potsie" Weber Actor Erin Moran Joanie Cunningham Actor Al Molinaro Al Delvecchio Guest Star Scott Baio Chachi Arcola Guest Star Lynda Goodfriend Lori Beth Allen Guest Star Ted McGinley Roger Phillips Guest Star Cathy Silvers Jenny Piccalo Guest Star Lyle Waggoner Bobby Burns Guest Star Ellen Travolta Louisa Arcola Guest Star Dennis Mandel Eugene Belvin Guest Star Phillip R. Allen Eddie Monroe Guest Star Bill Morey Army Captain John Slaughter Guest Star Harris Kal Bobby Guest Star Michele Tobin Allison Guest Star Peter MacLean David Allen Guest Star Anne Gee Byrd Emily Allen Guest Star Raymond Guth Mr. Gampolo Guest Star Jerry Paris Director