Matrix
Robert Perry
 It features the Seventh Doctor and Ace. It also includes appearances by the Wandering Jewhttp://www.bbc.co.uk/doctorwho/news/cult/news/drwho/2004/01/01/13704.shtml and Jack the Ripper. Part of it is set in an alternate timeline, featuring parallel universe versions of Ian Chesterton and Barbara Wright. The villain is the Valeyard.