Fletcher discovers that his fellow inmates are planning to escape.
| Actor | Role |
|---|---|
 Ronnie BarkerFletcher | Fletcher |
 Brian WildeMr. Barrowclough | Mr. Barrowclough |
 Fulton MackayMr. Mackay | Mr. Mackay |
 Richard BeckinsaleGodber | Godber |
 Peter VaughanHarry Grout | Harry Grout |
 Graham CrowdenPrison Doctor | Prison Doctor |
 Sam KellyWarren | Warren |
 Christopher BigginsLukewarm | Lukewarm |
 Carol HawkinsSandra | Sandra |
| EElisabeth DayNurse | Nurse |
| JJohn CannonPrisoner (uncredited) | Prisoner (uncredited) |
| EEden FoxPrisoner (uncredited) | Prisoner (uncredited) |
| EEric FrenchWarder (uncredited) | Warder (uncredited) |
| CCharlie GrayPrisoner (uncredited) | Prisoner (uncredited) |
| EEric KentPrisoner (uncredited) | Prisoner (uncredited) |
| RRonald NunneryPrisoner (uncredited) | Prisoner (uncredited) |
| PPaul PhillipsPrisoner (uncredited) | Prisoner (uncredited) |