It's the 33rd century. Using his psychic paper while posing as a "Mr Smith" at a hypernet telepathic kiosk on space station Psilon, the Doctor enlists the Psilons and their powerful telepathy to track Agent 99, missing in action for some time. The Doctor leaves with Agent 99's telepathic signature and goes to the planet Lossk. From there he uses "Tryptic Thought Crystals of Lossk" to find Agent 99. With Amy Pond and Rory Williams, he travels to the planet Quiox, the deadliest planet in the galaxy.