Stuck in the end of a hyperspace tunnel lies a huge, chaotic, space city known as the G-Lock -- the end product of the most terrible intergalactic traffic jam in history. It has now been transformed into a death-themed park, where the major attraction is a death-simulator known as the Beautiful Death. However, the power generated by people enjoying the ride is being diverted to a mysterious destination. A creature called the Repulsion is on the loose, offering resurrection in two hundred year's time to anyone who will surrender to it, allowing it to exist in the real world. Can the Doctor defeat it, and escape from the G-Lock before the interface between hyperspace and real space collapses?