Army of Ghosts (1) - S2.E12

Ghostly beings have been regularly appearing across the world and people, believing them to be their dead loved ones, are welcoming their visits with open arms. When the TARDIS arrives at the Torchwood Institute, the Tenth Doctor and Rose are taken prisoner. They are drawn into the investigation of a mysterious sphere kept in Torchwood Tower, and monstrous foes return as two universes collide.