It’s genuinely handy having those space-time telegraph messages! It allows the bewildered "Brigadier" (Nicholas Courtney) to call upon the "Doctor" (Tom Baker), "Sarah Jane" (Elisabeth Sladen), and "Harry" (Ian Marter) so they can return to Earth and look into the complete demolition of some oil platforms near Scotland that were thought to be unbreakable. This gives them a reason to wear their best Scottish clothes a…