A demented nun sliding through morphine addiction into madness, while presiding over a regime of lesbianism, torture and death. Sister Gertrude is the head nurse/nun in a general hospital, whose increasingly psychotic behavior endangers the staff and patients around her.
| Actor | Role |
|---|---|
 Anita EkbergSister Gertrude | Sister Gertrude |
 Joe DallesandroDr. Patrick Roland | Dr. Patrick Roland |
 Alida ValliMother Superior | Mother Superior |
 Massimo SeratoDr. Poirret | Dr. Poirret |
| DDaniele DublinoDirector | Director |
 Paola MorraSister Mathieu | Sister Mathieu |
 Lou CastelPeter | Peter |
 Laura NucciBaroness | Baroness |
 Alice GherardiNurse | Nurse |
| LLee De BarriaultNot listed | Not listed |
| IIleana FraiaFlorence | Florence |
| AAntonietta PatriarcaNot listed | Not listed |
 Sofia LusyJanet | Janet |
 Nerina MontagnaniJosephine | Josephine |
 Franco CaraccioloPriest in Confessional | Priest in Confessional |
 Maria Sofia AmendoleaNot listed | Not listed |
| CChicca ThomasNot listed | Not listed |
| MManlio PierottiNot listed | Not listed |
 Brunello ChiodettiSister Gertrude's Lover | Sister Gertrude's Lover |
 Enzo SpitaleriNot listed | Not listed |
| LLesly ThomasNot listed | Not listed |
| AAldo De FranchiNot listed | Not listed |
| CCarolyn De FonsecaSister Gertrude (voice) (uncredited) | Sister Gertrude (voice) (uncredited) |