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 Emily Moultrie Guest Star Anson Downes Guest Star John C. Becher Guest Star Tom Bosley Guest Star Chris McDermott Guest Star Marion Ross Guest Star Brian Byers Guest Star Lisa Lindgren Guest Star Joy Claussen Guest Star Rick Lantz Guest Star Julie Paris Guest Star Fred Fox Jr. Writer William Bickley Writer James Patrick Dunne Writer Lowell Ganz Writer, Director Tom Trbovich Director Michael Warren Writer Joel Zwick Director