Born into a well-off family, Franz Blum had led a carefree youth until, some time after graduating from high school, he was arrested by the police. For, involved by a gang of bad boys, the young man had taken part in a bank robbery. A "heroic deed" which earned him six years in prison. Once behind bars, he was treated with ruthless inhumanity by the guards. And little by little - but inexorably - Franz turned into an insurgent...
| Actor | Role |
|---|---|
 Jürgen ProchnowFranz Blum | Franz Blum |
 Burkhard DriestWalter „Tiger“ Kuul | Walter „Tiger“ Kuul |
 Tilo PrücknerZick Zack | Zick Zack |
 Lutz MackensyM | M |
| FFritz HollenbeckAldo Fuchs | Aldo Fuchs |
 Edgar Bessen2. Aufseher | 2. Aufseher |
 Kurt RaabAufseher Wupke | Aufseher Wupke |
 Gert HauckeOberverwalter Engelweich | Oberverwalter Engelweich |
 Charles BrauerAnstaltsleiter | Anstaltsleiter |
 Horst BeckDr.Stern | Dr.Stern |
| EEike GallwitzNot listed | Not listed |
 Günter MeisnerBorsig | Borsig |
| CClaus-Dieter ReentsNot listed | Not listed |
| MMarianne KehlauNot listed | Not listed |
 Günter SpörrleNot listed | Not listed |
| FFranz Josef SteffensNot listed | Not listed |
| MManfred GüntherNot listed | Not listed |
| KKarl-Heinz MerzNot listed | Not listed |
| GGottfried KramerNot listed | Not listed |
| HHanns GosslarNot listed | Not listed |
| JJochen SehrndtNot listed | Not listed |