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)

Derrick De Marney

(uncredited)

Amelia Earhart

Amelia Earhart (archive footage) (uncredited)

Cameron Hall

Dr. John Jeffries (uncredited)

David Horne

Nero (uncredited)

Kenneth Kove

Gentleman at Reception (uncredited)

Charles A. Lindbergh

Charles Lindbergh (archive footage) (uncredited)

Peter Madden

American Airliner Pilot (uncredited)

Percy Marmont

Wilbur Wright (uncredited)

Carlo Ninchi

Gabriele Adanti di Perugia (uncredited)

Hilary Pritchard

Cayley's Coachman (uncredited)

Michael Rennie

Marquis d'Arlandes (uncredited)

Roy Royston

Hubert Latham (uncredited)

Margaretta Scott

Isobella d'Este (uncredited)

Ben Webster

Leonardo da Vinci (uncredited)