Characters played by Heinz-Detlev Bock
Narrator
Characters played by Klaus Kindler
Narrator
Characters played by Christian Marschall
Narrator
Characters played by Aleksandr Kazantsev
Self - Moscow Academy of Natural Science
Characters played by Wiatscheslav Saitsew
Self - Academy of Science, Minsk
Characters played by Hans Domnick
Participation
Characters played by Jean Fontaine
Narrator (English version)
Characters played by Thor Heyerdahl
Participation
Characters played by Bruce Johansen
Narrator (English version)
Characters played by Hermann Oberth
Participation
Characters played by Lee Pajan
Narrator (English version)
Characters played by Henning Skaarup
(Danish narrator)
Characters played by Erich von Däniken
Self