Frederick Culley
Roger Bacon
Laurence Olivier
Vincent Lunardi
Franklin Dyall
Jerome de Ascoli
Hay Petrie
Tiberius Cavallo
John Turnbull
Von Zeppelin
Alan Wheatley
Giovanni Alfonso Borelli
John Abbott
Jean-François Pilâtre de Rozier
Charles Frend
Narrator (voice)
Edward Ashley
(uncredited)
Andrea Checchi
Zoroastro (uncredited)