Sam Waterston as Cal Morse

Kathleen Quinlan as Joanie Morse

Yaphet Kotto as Major Connolly

Jeffrey DeMunn as Dr. Dan Fairchild

Richard Dysart as Dr. Nielsen

G.W. Bailey as Tom Schmidt

Jerry Hardin as Vic Flint

Rick Rossovich as Bob

Cynthia Carle as Dana

Scott Paulin as Captain Walston

Kavi Raz as Dr. Ramesh Kapoor

Keith Szarabajka as Tippett

J. Patrick McNamara as Connolly's Aide

Tom McFadden as Deputy Grazie

Jack Thibeau as Pisarczyk

Kyle T. Heffner as Video Technician #1

Meshach Taylor as Video Technician #2

Lori Hallier as TV Reporter

Jeannie Epper as Woman on Video Screen

Bernard Behrens as (uncredited)