Peter van Eyck as Maj. Bob Anders

O.E. Hasse as Prof. Larsen

Yvonne Furneaux as Gilda Larsen

Walter Rilla as Prof. Pohland

Ernst Schröder as Chefarzt

Dieter Eppler as Kaspar

Wolfgang Preiss as Dr. Mabuse

Rika Dialina as Judy

Robert Beatty as Col. Matson

Valéry Inkijinoff as Dr. Krishna

Claudio Gora as Direktor Botani / Dr. Mabuse

Gustavo Rojo as Mario Monta

Massimo Pietrobon as Jason Monta

Charles Fawcett as Cmdr. Adams

Erich Koltschack as Lutto

Feodor Chaliapin Jr. as Apotheker

Leo Genn as Adm. Quency

Yoko Tani as Mercedes

Renate Danz as Mercedes (voice)

Erich Fiedler as Direktor Botani (voice)

Heinz Giese as Col. Matson (voice)

Reinhard Kolldehoff as Lotus (voice)

Arnold Marquis as Adm. Quency (voice)

Gerd Martienzen as Mario Monta (voice)

Joachim Nottke as Dr. Mabuse (voice)

Friedrich Schoenfelder as Jason Monta (voice)

Siegfried Schürenberg as Cmdr. Adams (voice)

Fritz Tillmann as Dr. Krishna (voice)

Alexander Welbat as Kaspar (voice)