Ivan Dixon

Major Harold Giles,Sgt. James Conover

Robert Duvall

Adam Ballard,Louis Mace

Willard Sage

Coulter,Chief of Staff,First Reporter

Robert Culp

Trent,Paul Cameron,Allen Leighton

John Hoyt

Bifrost Alien,Professor Hebbel,Emmett Balfour

Jason Wingreen

Fred Severn,Bill Turner,Coroner Leland

Douglas Henderson

Dr. Tillyard,Detective Lt. Runyan,Dr. Paul Fredericks (uncredited)

Edward Platt

Dean Radcliffe,Mr. Terrence,David Hunt

Ted de Corsia

Randolph E. Branch,New Sentry

Ben Wright

Philip Exeter Dundee,Elder of Luminos,Gen. Benton