The presence of mafia boss Vangelli's yacht in front of the island of Ventotene brings a group of prisoners of the penitentiary close.
| Actor | Role |
|---|---|
 Philippe LeroyCol. Remy | Col. Remy |
 Dagmar LassanderPupa | Pupa |
 Raymond PellegrinVangelli | Vangelli |
 Franco CittiCiro | Ciro |
 Maurizio ArenaMarpione | Marpione |
 Augusto MartelliMichele | Michele |
 Enzo RobuttiNot listed | Not listed |
 Armando TortoriciPrison Guard | Prison Guard |
 Luciano PigozziNot listed | Not listed |
 Ernesto ColliNot listed | Not listed |
 Rosaura MarchiNot listed | Not listed |