I struggle a bit with the eight parters. The story is often far too thinly spread out and the plot advances at a glacial pace until it's all wrapped up in episodes seven and eight. This one is slightly different, though, as it neatly separates into two semi-stories. The first sees the "Doctor" (Jon Pertwee) and "Liz" (Caroline John) drafted in by the "Brigadier" (Nicholas Courtney) to investigate some power outages at a top secret energy installation being run by "Quinn" (Fulton Mackay). Their arrival sets the cat amongst the pigeons, especially with the secretive Scotsman and his assistant "M...