Bradford Dillman
Dobler
Priscilla Barnes
Claire
Daryl Haney
O'Neill
Eb Lottimer
Seaver
Richard Young
Chadwick
Stephen Davies
Fernandez
Roger Corman
Corporate executive (uncredited)
Mel Ryane
Barbara
Gregory Sobeck
Engel
John Lafayette
Shuttle commander
Michael Adams
Shuttle crewman
Karen Winograd
Shuttle crewwoman