 Dirk BogardeDr. Henry Laidlaw Longman | Dr. Henry Laidlaw Longman |
 Mary UreOonagh Longman | Oonagh Longman |
 John ClementsMajor Hall | Major Hall |
 Michael BryantDr. Danny Tate | Dr. Danny Tate |
 Wendy CraigAnnabella | Annabella |
 Harold GoldblattProfessor Sharpey | Professor Sharpey |
 Geoffrey KeenCalder | Calder |
| TTerry PalmerNorman | Norman |
 Norman BirdAubrey | Aubrey |
 Terence AlexanderRowing Coach (uncredited) | Rowing Coach (uncredited) |
 Grace ArnoldTrain Passenger (uncredited) | Train Passenger (uncredited) |
| TTimothy BeatonPaul Longman (uncredited) | Paul Longman (uncredited) |
 Elizabeth CounsellGirl Student on Station (uncredited) | Girl Student on Station (uncredited) |
 Roger DelgadoDr. Jean Bonvoulois (uncredited) | Dr. Jean Bonvoulois (uncredited) |
| IIan DewarCrowd Ringleader (uncredited) | Crowd Ringleader (uncredited) |
| GGeoffrey DentonTrain Guard (uncredited) | Train Guard (uncredited) |
| AAshik Devello2nd Indian Student (uncredited) | 2nd Indian Student (uncredited) |
 Terence Edmond1st Student at Party (uncredited) | 1st Student at Party (uncredited) |
 Christopher EllisPeers Longman (uncredited) | Peers Longman (uncredited) |
 Edward FoxStewart (uncredited) | Stewart (uncredited) |
 Imogen HassallStudent (uncredited) | Student (uncredited) |
 Robin HawdonStudent (uncredited) | Student (uncredited) |
| GGeorgina MoonPersephone Longman (uncredited) | Persephone Longman (uncredited) |
| EEdward PalmerPorter (uncredited) | Porter (uncredited) |
 Philip RayFather (uncredited) | Father (uncredited) |
 Renu Setna1st Indian Student (uncredited) | 1st Indian Student (uncredited) |
| AAnthony SingletonBoy Student on Station (uncredited) | Boy Student on Station (uncredited) |
| TTeresa Van HoornPenny Longman ( uncredited) | Penny Longman ( uncredited) |
 David WestonStudent at Party (uncredited) | Student at Party (uncredited) |
| PPauline WinterMother (uncredited) | Mother (uncredited) |
