• 
  Leslie Howard

  Professor Horatio Smith
• 
  Basil Appleby

  Jock MacIntyre
• 
  Mary Brown

  Girl Student
• 
  Ernest Butcher

  Weber
• 
  Philip Friend

  Spencer
• 
  Peter Gawthorne

  Sidimir Koslowski
• 
  Arthur Hambling

  Jordan
• 
  Allan Jeayes

  Dr Benckendorf

• 
  Joan Kemp-Welch

  School-Teacher
• 
  Laurence Kitchin

  Clarence Elstead (as Lawrence Kitchen)
• 
  Aubrey Mallalieu

  Dean
• 
  Hugh McDermott

  David Maxwell (as Hugh Macdermott in opening credits)
• 
  David Tomlinson

  Steve
• 
  Manning Whiley

  Bertie Gregson
• 
  Ben Williams

  Graubitz