Steve Barclay

as Naval Officer (uncredited)

as Tom's Classmate (uncredited)

as Flier (uncredited)

as Georges Villiers, duc de Buckingham

as Eddie Wheeler

as Tracy

as Paolo

as Conduttore della biga

as Bruce Landy

as Smiley Gordon

as Jeff Regan

as Ted Cummings (as Stephen Barclay)

as Marco Adinolfi

as George Whitmore

as Stefano Carli

as Kenny Revere

as Captain James Glover

as Stefano

as Cap. Droet