Tommy Kirk as Tommy Carpenter

Annette Funicello as Annette Aliotto

Nino Castelnuovo as Bruno

Clelia Matania as Aunt Gisella

Carlo Rizzo as Uncle Mario

Ivan Desny as Count Roberto

Venantino Venantini as Lorenzo

Ivan Triesault as Professor Levenson

Odoardo Spadaro as Padrone

Renzo Palmer as Carabiniere

Richard Watson as Butler

Helen Stirling as Miss Brooks

Elisa Cegani as Felicia

Liana Del Balzo as Countess Della Scala

George Ehling as Gino