 Paolo VillaggioDr. Jekyll / Mr Hyde | Dr. Jekyll / Mr Hyde |
 Edwige FenechBarbara Wimply | Barbara Wimply |
 Gianrico TedeschiJames / Jeeves | James / Jeeves |
 Gordon MitchellPretorius | Pretorius |
 Paolo PaoloniProfessor | Professor |
 Guerrino CrivelloStudent | Student |
 Eolo CaprittiHenchman | Henchman |
 Francesco AnniballiHenchman | Henchman |
| WWalter WilliamsPANTAC Top President | PANTAC Top President |
 Clemente UkmarHenchman | Henchman |
 Geoffrey CoplestonArchibald Gold | Archibald Gold |
| PPaola ArduiniStewardess | Stewardess |
 Angelo BoscariolPANTAC Board Member (uncredited) | PANTAC Board Member (uncredited) |
 Luciano FotiClass Member (uncredited) | Class Member (uncredited) |
 Alfonso GigantiIndustrialist (uncredited) | Industrialist (uncredited) |
| JJuba KennerleyGentleman (uncredited) | Gentleman (uncredited) |
 Giuseppe MarroccoPANTAC Board Member (uncredited) | PANTAC Board Member (uncredited) |
 Fulvio MingozziPANTAC Board Member (uncredited) | PANTAC Board Member (uncredited) |
 Alessandro TedeschiProfessor introducing Jekyll (uncredited) | Professor introducing Jekyll (uncredited) |
 Luciano ZanussiPANTAC Board Member (uncredited) | PANTAC Board Member (uncredited) |
