Elenco - The Brain
Anne Heywood
Anna Holt
Peter van Eyck
Dr. Peter Corrie
Cecil Parker
Stevenson
Bernard Lee
Dr. Frank Shears
Ellen Schwiers
Ella
Siegfried Lowitz
Mr. Walters
Hans Nielsen
Immerman
Jeremy Spenser
Martin Holt
Maxine Audley
Marion Fane
Jack MacGowran
Furber
Miles Malleson
Dr. Miller
George A. Cooper
Thomas Gabler
Dieter Borsche
Dr. Miller
Ann Sears
Stevenson's secretary
Irene Richmond
Mrs. Gabler
Allan Cuthbertson
Da SilvaBandana Das Gupta
Miss Soong
Alister Williamson
Inspector Pike
Patsy Rowlands
Young Woman at Dance Hall (uncredited)
Bryan Pringle
Dance Hall MC (uncredited)