 Michael RedgraveRuxton Towers Reformatory Governor | Ruxton Towers Reformatory Governor |
 Tom CourtenayColin Smith | Colin Smith |
 Avis BunnageMrs. Smith | Mrs. Smith |
 Alec McCowenBrown, House Master | Brown, House Master |
 James BolamMike | Mike |
 Joe RobinsonRoach | Roach |
 Dervis WardDetective | Detective |
| TTopsy JaneAudrey | Audrey |
 Julia FosterGladys | Gladys |
 James FoxWilly Gunthorpe - Ranley School Runner (uncredited) | Willy Gunthorpe - Ranley School Runner (uncredited) |
 John ThawBosworth (uncredited) | Bosworth (uncredited) |
 Arthur MullardChief Borstal Officer (uncredited) | Chief Borstal Officer (uncredited) |
 Philip MartinStacy (uncredited) | Stacy (uncredited) |
| JJohn BrookingGreen (uncredited) | Green (uncredited) |
| RRaymond DyerGordon (uncredited) | Gordon (uncredited) |
| AAnthony SagarFenton (uncredited) | Fenton (uncredited) |
| PPeter KrissScott (uncredited) | Scott (uncredited) |
 Peter MaddenMr. Smith (uncredited) | Mr. Smith (uncredited) |
| DDallas CavellLord Jaspers (uncredited) | Lord Jaspers (uncredited) |
| JJames CairncrossMr. Jones (uncredited) | Mr. Jones (uncredited) |
 Frank FinlayBooking Office Clerk (uncredited) | Booking Office Clerk (uncredited) |
| RRobert PercivalTory Politician (uncredited) | Tory Politician (uncredited) |
 Ray AustinHarry Craig (uncredited) | Harry Craig (uncredited) |
 Derek FowldsBorstal Inmate (uncredited) | Borstal Inmate (uncredited) |
 Billy MurrayBorstal Inmate (uncredited) | Borstal Inmate (uncredited) |
| EErnest BlythArmy Officer at Sports Day (uncredited) | Army Officer at Sports Day (uncredited) |
 Jim BradyMan in Cafe (uncredited) | Man in Cafe (uncredited) |
| JJohn BullRonalds (uncredited) | Ronalds (uncredited) |
| PPeter DuguidDoctor (uncredited) | Doctor (uncredited) |
 Charles DyerBit Part (uncredited) | Bit Part (uncredited) |
