Cliff Robertson

as Col. Edwin A. 'Buzz' Aldrin Jr.

Shirley Knight

as Joan Aldrin

Charles Cioffi

as Dr. Sam Mayhill

Ralph Bellamy

as Col. Edwin E. Aldrin

Stefanie Powers

as Marianne

Kraig Metzinger

as Andy Aldrin

Tony Marks

as Mike Aldrin

Stephen Pearlman

as Dr. Hotfield

Stefan Gierasch

as Al Davis

Mark Roberts

Lance Henriksen

Conard Fowkes

George D. Wallace

Robert Karnes

Davis Roberts

Sandra de Bruin

Anne Newman Bacal

Robert B. Williams

Shelley Mitchell

Bob Harks