Don Ameche

as Self (archive footage)

as Grandpa Harry

as Shadow (voice)

as Harry Aldrich

as Father Clemente

as Gino

as Art Selwyn

as Dr. Wallace Wrightwood

as Arthur Selwyn

as Mortimer Duke

as Commander Taylor

as Edward Shelley

as Richard W. Courtland

as Joseph Jefferson 'Joe' Parker

as Bingo Harper

as Henry Van Cleve

as Dwight Dawson

as Phil O'Neil (Credits) / Phil 'Mac' McNeil

as Larry Martin / Baron Manuel Duarte

as Ricardo Quintana

as Edward Solomon

as Alexander Graham Bell

as Tibor Czerny

as D'Artagnan

as Charlie Dwyer

as Jack O'Leary

as Martin J. Canavan