THE DOCTOR IS IN ANCIENT EGYPT IN 1334 BC.
He has just helped Queen Nefertiti to defend an attack from giant alien locusts when he receives a text alert on his mobile. Nefertiti insists on coming with him as he travels to the Indian Space Agency in 2367 AD. There they learn that a spaceship the size of Canada is fast approaching Earth. ISA commander Indira will be forced to destroy the ship with a missiles if it comes within 10,000 km of the planet.