Wilford Brimley
as Dr. Blair
T.K. Carter
as Nauls
David Clennon
as Palmer
Keith David
as Childs
Richard Dysart
as Dr. Copper
Charles Hallahan
as Vance Norris
Peter Maloney
as George Bennings
Richard Masur
as Clark
A. Brimley
as Dr. Blair
Donald Moffat
as Garry