John Scanlon

John Scanlon was someone who managed to acquire a time ship and used it to, according to himself, change Earth's history to prepare it for an alien invasion in his own time, two thousand years in Edward Grainger's future. However, Scanlon also stole valuable artefacts from Earth's history, justifying it because he was trying to save Earth's future. He also travelled to 1936 and had photographs taken of King Edward VIII and Wallis Simpson, months before the photos should have been available. Grainger, working for the British government, was able to defeat Scanlon with the help of the Fifth Doctor and Peri Brown. (PROSE: The Church of Football)

Behind the scenes
The physical description of Scanlon resembles that of Peter Butterworth, who played the Monk in The Time Meddler and The Daleks' Master Plan. In addition, the interior of Scanlon's timeship resembles the interior of the Monk's TARDIS in The Time Meddler.