The only Doctor Who story to be officially titled "Doctor Who and..." (legend has it this was due to an error by the production team in putting the prefix onto the onscreen titles). While "Doctor Who" isn't his name, the actor was credited as playing "Doctor Who" until 1981 (and again in 2005), so the Word of God on the subject is clearly a bit suspect. Anyway, the Brigadier sends for the Doctor and Liz to take a look at an underground laboratory working on a new kind of nuclear reactor. They're getting odd power losses and a bizarrely high level of stress-related illnesses among the staff.