The Three Doctors (Doctor Who) the Third Doctor (Jon Pertwee) for help when Omega drains their civilisation's power. The serial opened the tenth anniversary year of the series, and features the first three Doctors all appearing in the same serial. This makes it the first "Doctor Who" story in which an earlier incarnation of the Doctor returns to the show. A superluminal signal is sent to Earth, carrying with it an energy blob that seems intent on capturing the Doctor. The homeworld of the Time Lords is also under siege, their power being drained through a black hole. Trapped themselves, and desperate to send help,
The Doctor (Doctor Who) Caligari and subsequently responds to the question "Doctor who?" with "yes, quite right". Question marks adorning his costuming in the 1980s seem to imply the "Who" moniker. The only real exceptions are the computer WOTAN in the serial "The War Machines", which commands that "Doctor Who is required" and, towards the end of the Second Doctor serial "Fury from the Deep", the Doctor is addressed as "Doctor Who" by Mr Harris during the dinner party. The Third Doctor's car, dubbed "Bessie", carried the plate WHO 1, the only ongoing reference to the "Doctor Who" enigma in the original programme. The