Dana Andrews

as Igor Gouzenko

Gene Tierney

as Anna Gouzenko

June Havoc

as Nina Karanova

Berry Kroeger

as John Grubb, aka 'Paul'

Edna Best

as Mrs. Albert Foster

Stefan Schnabel

as Col. Ilya Ranov

Nicholas Joy

as Dr. Harold Preston Norman, aka 'Alec'

Eduard Franz

as Maj. Semyon Kulin

Frederic Tozere

as Col. Aleksandr Trigorin (as Frederic Tozère)

Christopher Olsen

as Andrei Gouzenko

Noel Cravat

Anne Curson

Helena Dare

John Davidson

Michael Dugan

Reed Hadley

as Narrator (voice)

Mauritz Hugo

John Ridgely

John Shay

Brick Sullivan

Ken Terrell

Joe Whitehead

Peter Whitney

Victor Wood