Elenco

• 

  Robert Powell

  Richard Hannay

• 

  David Warner

  Sir Edmund Appleton

• 

  Eric Porter

  Chief Superintendent Lomas

• 

  Karen Dotrice

  Alex Mackenzie

• 

  John Mills

  Scudder

• 

  George Baker

  Sir Walter Bullivant

• 

  Ronald Pickup

  Bayliss

• 

  Donald Pickering

  Marshall

• 

  Timothy West

  Porton

• 

  Miles Anderson

  David