Oldřich Lukeš as Prof. Harringway Hawling

Ignacy Machowski as Prof. Saltyk

Julius Ongewe as Talua, afrikanischer Fernsehtechniker

Mikhail Postnikov as Prof. Arsenew

Kurt Rackelmann as Prof. Sikarna

Günther Simon as Robert Brinkmann, deutscher Pilot

Hua-Ta Tang as Dr. Tchen Yu

Lucyna Winnicka as Joan Moran

Yoko Tani as Sumiko Ogimura, japanische Ärztin

Ruth-Maria Kubitschek as Frau Arsenjew

Eva-Maria Hagen as Reporterin

Karen Fredersdorf as

Gertraud Kreissig as

Nico Turoff as

Werner Senftleben as

Eduard von Winterstein as Weimann, Kernphysiker

Stanisław Igar as Scientist (uncredited)

Artur Młodnicki as Scientist (uncredited)

Józef Pieracki as Scientist (uncredited)