Paolo Villaggio

Dr. Jekyll / Mr Hyde

Edwige Fenech

Barbara Wimply

Gianrico Tedeschi

James / Jeeves

Gordon Mitchell

Pretorius

Paolo Paoloni

Professor

Guerrino Crivello

Student

Eolo Capritti

Henchman

Francesco Anniballi

Henchman

Walter Williams

PANTAC Top President

Clemente Ukmar

Henchman

Geoffrey Copleston

Archibald Gold

Paola Arduini

Stewardess

Angelo Boscariol

PANTAC Board Member (uncredited)

Luciano Foti

Class Member (uncredited)

Alfonso Giganti

Industrialist (uncredited)

Steno