• 
  James Stewart

  Martin Breitner
• 
  Robert Young

  Fritz Marberg
• 
  William T. Orr

  Erich Von Rohn
• 
  Granville Bates

  Professor Berg
• 
  Dan Dailey

  Holl (as Dan Dailey Jr.)
• 
  Esther Dale

  Marta
• 
  William Edmunds

  Lehman
• 
  Bonita Granville

  Elsa

• 
  Russell Hicks

  Rector
• 
  Frank Morgan

  Professor Viktor Roth
• 
  Maria Ouspenskaya

  Mrs. Hilda Breitner
• 
  Gene Reynolds

  Rudi Roth
• 
  Irene Rich

  Mrs. Emilia Roth
• 
  Robert Stack

  Otto Von Rohn
• 
  Margaret Sullavan

  Freya Roth