Alex D. Linz

Wilhelm 'Billy' von Huber

William Atherton

Ralph Stanton

James Woods

Dr. Wilhelm von Huber

Annabeth Gish

Dr. Donni McGuinness

Tony Jay

Narrator (voice)

Jack McGee

Fielding

Mark Moses

Alan Shepard

Michael Tylo

Guidance Technician

Patrick Richwood

Dieter

Scott Thompson Baker

Telemetry Technician