Cast
Patrick Dempsey
Robert 'Bobby' Libner
James Gammon
Dr. Sturgeon The Cadillac Surgeon
Dean Jacobson
Young Marvin
Joseph Bologna
Uncle Phil
Terry Loughlin
Gas Station Attendant
David McCharen
Additional Voices (voice)
John Considine
Professor Kloppner, Eastbrook Academy
Daniel Stern
Marvin Libner
Rita Taggart
Betty Libner
Ray Lykins
Rick
Larry Moss
Additional Voices (voice)
Arye Gross
Buddy Libner
Alan Arkin
Fred Libner
Steve Alterman
Additional Voices (voice)
Annabeth Gish
Tammy
Edan Gross
Young Bobby
Randy Herman
Dog Track Gambler (uncredited)
Fred Ornstein
Barney
Judi Durand
Additional Voices (voice)