Puglia, southern Italy, around 1400. A convent is invaded by the Tarantula cult, whose fanatical and crazed members desecrate the sacred place by committing obscene and bloody acts.
| Actor | Role |
|---|---|
 Florinda BolkanFlavia Gaetani | Flavia Gaetani |
 María CasaresSister Agatha | Sister Agatha |
 Claudio CassinelliAbraham | Abraham |
 Anthony HigginsAhmed | Ahmed |
 Spiros FocásThe French Duke | The French Duke |
| DDiego MichelottiFlavia's Father | Flavia's Father |
 Raika JuriSister Livia | Sister Livia |
| JJill PrattMother Superior | Mother Superior |
| FFranca GreyVillage Girl | Village Girl |
 Laura De MarchiTarantula Cult Woman | Tarantula Cult Woman |
| EEduardo FiliponeNot listed | Not listed |
 Ciro IppolitoNot listed | Not listed |
 Carla ManciniNot listed | Not listed |
 Luigi Antonio GuerraNot listed | Not listed |
| GGiuseppe PertileNot listed | Not listed |
 Guido CelanoNot listed | Not listed |
| SStefano TrabalzaNot listed | Not listed |
 Valentino MacchiNot listed | Not listed |
 Maria Teresa PiaggioNot listed | Not listed |
 Jole SilvaniNot listed | Not listed |
| AAgnès NobecourtNot listed | Not listed |
 Romano MoraschiniExecutioner (uncredited) | Executioner (uncredited) |