Probe

Hugh O'Brian

Hugh Lockwood

Elke Sommer

Heideline 'Uli' Ullman

Burgess Meredith

V.C.R. Cameron

Lilia Skala

Frieda Ullman

Angel Tompkins

Gloria Harding

John Gielgud

Harold L. Streeter

Kent Smith

Dr. Edward Laurent

Alfred Ryder

Cheyne

Ben Wright

Kurt van Niestat

Robert Boon

Felix Ernst

Albert Popwell

Dr. Griffin

A Martinez

Carlos Lobos

Byron Chung

Kuroda

Ginny Golden

Miss Keach

Jules Maitland

Reinhardt Brugge

David Ahdar

Hotel Clerk (uncredited)

Robert Cole

Waiter (uncredited)

John Daheim

Guard (uncredited)

Jan Daley

Lockwood's Girl (uncredited)

Joanna Frank

Stewardess (uncredited)