A neurosurgeon with a cheating wife takes an amnesiac into his home and conditions him to believe that the cheating wife is his own and to take the "appropriate" action.
| Actor | Role |
|---|---|
 Charles BronsonThe Stranger | The Stranger |
 Anthony PerkinsLaurence Jeffries | Laurence Jeffries |
 Jill IrelandFrances Jeffries | Frances Jeffries |
 Henri GarcinPaul Damien | Paul Damien |
 Agathe NatansonLucy | Lucy |
 André PenvernIntern | Intern |
 Denise PéronneNurse | Nurse |
 Carl StuderFisherman (as Carl J. Studer) | Fisherman (as Carl J. Studer) |
| SSilvana BlasiMrs. Evans | Mrs. Evans |
| AAdriano MagistrettiAndrew | Andrew |
| VViviane EverlyYoung Girl on Beach | Young Girl on Beach |
| IIsabelle Del RioNurse | Nurse |
| CColin MannSgt. Gordon | Sgt. Gordon |
 Yves ElliotPoliceman | Policeman |