The final episode of the seventh season of Doctor Who, The War Games, saw the departure of Patrick Troughton as the Second Doctor and Frazer Hines and Wendy Padbury as companions Jamie McCrimmon and Zoe Heriot. It was the first time in the history of Doctor Who that either a companion or an incarnation of the Doctor made their last regular appearance in the concluding episode of a season. It was also the first time that an incarnation of the Doctor and all his companions were written out of the program in the same story. In addition, this was the last time the series was broadcast in black and white.
The Doctor watched Zoe as she returns to the Wheel at the exact moment she left. Everything is fine except she says she feels like she has forgotten something important.
He then asks to see Jamie, who wakes up in the middle of nowhere and immediately is shot at by a Redcoat. Jamie attacks him with his sword. The Doctor chuckles and turns to his people. He enquires what fate has in store for him. They have accepted his plea that evil has to be fought and that he has his part to play in that. He asks if he is to go free. The Time Lords says he is to be exiled on the planet Earth in the 20th century — as it is there that he has shown the most affinity. In addition, the secret of the TARDIS is to be taken away from him.
The Doctor is appalled by this. He says that he is known on Earth, and it could cause him some difficulties. The Time Lords say they will change his appearance again. He is furious at this but is placated when he is told that he can choose. He is shown five faces that he successively adjudges to be too old, fat, thin, young or that “it won’t do at all”. He wheels around and begins to shout at the Time Lords but starts to lose function and the ability to talk. He goes into a daze. He is still railing against his punishment as he begins to drift into nothingness… [tardis.wikia.com]