Doctor Who "Matrix": The Time Lord known as the Valeyard travels to 1888 London and takes on the identity of Jack the Ripper. He uses the Ripper murders to power the Dark Matrix, the computer that harbors all the Time Lords' evil impulses. He plans to unleash the Dark Matrix on the universe and transform it into an unimaginable nightmare. (Jack the Ripper also showed up in an unfilmed script for t
