Invisible Enemy

Alan Marshal

Jeffrey Clavering

Tala Birell

Sandra Kamarov

Mady Correll

Princess Stephanie

C. Henry Gordon

Nikolai Kamarov

Herbert Mundin

Sergeant Alfred M. Higgs

Gerald Oliver Smith

Bassett

Ivan F. Simpson

Michael (as Ivan Simpson)

Elsa Buchanan

Sophia

Dwight Frye

Alex

Leonard Willey

Sir Herbert Donbridge

Ian Maclaren

Sir Joshua Longstreet

Egon Brecher

Kirman

Frank Puglia

Signor Bramucci

Sidney Bracey

Kamarov's Butler

Lawrence Grant

Foreign Diplomat

Keith Hitchcock

Secondary Supporting Role

Paul Sutton

Chauffeur

Wilhelm von Brincken

Foreign Diplomat