While walking along the beach, Christian and his girlfriend discover a mysterious woman washed ashore. The following day, Christian meets the woman again at a yacht party and soon finds himself entangled in a web of lust, intrigue and murder.
Unfortunately the movie Spasmo is not yet available on HBO Max.
| Directing | Umberto Lenzi | Director |
| Sound | Ennio Morricone | Original Music Composer |
| Writing | Luisa Montagnana | Screenplay |
| Writing | Massimo Franciosa | Screenplay |
| Writing | Pino Boller | Screenplay |
| Writing | Umberto Lenzi | Screenplay |
| Production | Ugo Tucci | Producer |
| Editing | Eugenio Alabiso | Editor |
| Crew | Guglielmo Mancori | Cinematography |
| Costume & Make-Up | Silvio Laurenzi | Costume Design |
| Costume & Make-Up | Pierantonio Mecacci | Makeup Artist |
| Art | Giacomo Caló Carducci | Production Design |
