Bradford Dillman

Dobler

Priscilla Barnes

Claire

Daryl Haney

O'Neill

Mel Ryane

Barbara

Eb Lottimer

Seaver

Gregory Sobeck

Engel

Richard Young

Chadwick

Stephen Davies

Fernandez

John Lafayette

Shuttle commander

Michael Adams

Shuttle crewman

Karen Winograd

Shuttle crewwoman

Roger Corman

Corporate executive (uncredited)

Mary Ann Fisher