Scott Baio Charles "Chachi" Arcola Actor Erin Moran Joanie Cunningham Actor Al Molinaro Al Delvecchio Actor Ellen Travolta Louisa Arcola Delvecchi Actor Art Metrano Uncle Rico Mastorelli Actor Robert Pierce Bingo Actor Derrel Maury Mario Mastorelli Actor Winifred Freedman Annette Actor Jeff Lester Guest Star Chris McDermott Guest Star Brian Byers Guest Star Lisa Lindgren Guest Star Rick Lantz Guest Star James Patrick Dunne Writer Lowell Ganz Director