Army of Ghosts

"Army of Ghosts" is the twelfth and penultimate episode in the second series of the British science fiction television programme Doctor Who which was first broadcast on BBC One on 1 July 2006. It is the first episode of a two-part story; the concluding episode, "Doomsday", was first broadcast on 8 July. The episode is set in London, some time after the events of the 2006 episode "Love & Monsters". In the episode, the Cybermen come to Earth from a parallel world by following a spherical ship through an interdimensional breach. The Torchwood Institute intends to open this breach further for use as an energy source. Plot Jackie shows the Tenth Doctor and Rose a vaguely humanoid and luminous silhouette that momentarily appears in her flat, which Jackie insists is the ghost of her deceased father. Jackie explains that for the past two months, millions of ghosts began appearing all over the world. Humans have come to accept them and believe that they are the manifestations of loved ones. Conducting an experiment, the Doctor determines that the ghosts are in fact impressions of something forcing its way into this universe. The Doctor tracks the signal back and uses the TARDIS to travel there with Rose and Jackie, arriving at the Torchwood Institute in Canary Wharf. The Doctor and Jackie are taken by soldiers to see Torchwood's director Yvonne Hartman, while the TARDIS is impounded with Rose inside. Yvonne shows the Doctor the invisible breach which is the source of the ghost energy, along with a ship which came through the breach: a "Void ship", designed to exist in the space between universes known as the Void. Torchwood built One Canada Square around the breach and conducted experiments on it, forcing it open in an attempt to harness it as a source of energy. Yvonne also reveals to the Doctor that his encounter with Queen Victoria made him an enemy of the state and was the catalyst for the creation of Torchwood.