The Second Doctor has been partially regenerated by the Time Lords as punishment for breaking the non-interference policy, but the process is stopped halfway, leaving the Doctor an amalgam of his second and as-of-yet future incarnation. The Doctor is sent on a mission which involves battling Daleks, where he sees many people die. Afterwards, he is sent to a void by a pair of Time Lords, where he finds his TARDIS. Inside he tries to leave, but finds the ship not working. He is suddenly granted by an old man in a suit, who reveals himself to be the Third Doctor — the man who the Doctor was meant to turn into. The Doctor prepares himself for the rest of his regeneration, and collapses in a chair. There, he completes his transformation. Awakening, he is greeted by one of the Time Lords on the TARDIS' viewing screen, who wipes the Doctor's mind of his knowledge of time travel and sends the TARDIS to Earth. There, the Doctor exits the TARDIS and collapses outside.