he uses the TARDIS's "Jade Pagoda" and defeats a Cyberman plot in 2006. Alternate History Cycle The TARDIS lands in a tar pit in an Earth ruled by the Silurians. This is an alternate universe in which the Third Doctor died in a Silurian prison and was not able to prevent the Silurian plague from devastating the human race. The Doctor recognizes that this universe is draining energy from the real one, and creates a Time Ram with his counterpart's TARDIS and his own, to destroy the altered reality; his own TARDIS is apparently destroyed, and he leaves in his counterpart's. The Doctor realises that someone has been altering the past, including the Doctor's own timeline. An alteration of the Doctor's encounter with the Matrix allows an ancient Gallifreyan evil to be resurrected; the psychic force of a dead Aztec priest-king survives for much longer than it should; and the Land of Fiction survives the Doctor's previous visit, with a new Writer (a young man named Jason) who traps the Doctor in a poorly constructed fictional world. Eventually the changes are revealed as the work of the Meddling Monk here named "Mortimus" and using a captured Chronovore to alter the timeline. He frees the Vardans from the time loop the Doctor had imprisoned them in, but the Doctor and UNIT are able to defeat an attempted Vardan invasion of Earth in 1976. Ace pretends to join the Monk and frees the Chronovore, who restores (most) of the altered realities to their status quo ante. Her encounter with the Monk also helps Ace to forgive the Doctor for his past manipulations. After a visit to Peladon, Benny briefly leaves the Doctor and Ace to join an Ice Warrior archaeological team on Phaester Osiris. She rejoins them in time for the trio to become involved in a complex scheme by Irving Braxiatel to defeat a civilization of theatre-obsessed conquerors who had been threatening the Braxiatel Collection. In 1887, the trio join forces with Sherlock Holmes and Dr. Watson and encounter the Giant Rat of Sumatra before eventually traveling to Bombay and the planet Ry'leh to foil an alien impersonating the Great Old One Azathoth. After spending several months running a speakeasy in 1920s Chicago, the Doctor returns to E-Space to face a renewed Vampire threat, and is reunited with Romana, who returns with him to Gallifrey. At an Air Force base in