The tenth doctor and Rose travel to ancient Egypt, where the doctor's life is threatened while looking for the secret behind a strange light bulb with mystical properties. Rose tries to save him, but ends up putting him in even more jeapordy. Meanwhile, the ultimate key to their problems remains hidden in the pyramids.

AU version of "Beast's Obsession," starts off with the scene at the granary after Olivia shows up to rescue the girl, with an alternate ending. This is EO, so Elliot makes a reappearance.