The Doctor takes Ace back to the London district of Perivale where she grew up. Thinking that his young friend wanted to visit her former home which he discovers to be quite the contrary. For Perivale Is hardly the most exciting place in the world. Or at least it didn't used to be. As the duo discover when they are informed of a spate of mysterious disappearances that have recently taken place in the last few weeks. Some of which are old friends that Ace grew up with. Intruiged, the Doctor endeavors to uncover what is behind people seemingly vanishing off the face of the Earth. But doing so ends up getting the cosmic time traveler wrapped up in a deadly game of survival on another world. Pitting himself and his young companion against a race of cat like creatures called the Cheetah people. And an old adversary from the Time Lords past. Written by
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I felt like I could run forever, like I could smell the wind and feel the grass under my feet, and just run forever.
The planet's gone, but it lives on inside you, and it always will.