The Doctor receives a distress signal from an old friend. Could there really be another living Time Lord out there? Hopes raised, he follows the signal to a junkyard planet sitting upon a mysterious asteroid in a Bubble universe, populated by a very strange family. The Doctor, Amy and Rory are given the warmest of welcomes by Auntie, Uncle and Nephew.

But the beautiful and insane Idris greets them in a more unusual fashion—what is she trying to tell the Doctor? As the Doctor investigates, he unwittingly puts his friends in the gravest danger.