When the Ux apparently decided he was the Creator. But he was hardly the only person to land on the planet, and the Ux seem to be knowledgeable about Doctor Who "technology" (they recognized the TARDIS as "dimensionally transcendental," for instance). It also seems like they wouldn't assume ...

Doctor Who often seems to find spaceships buried under London (For example the Cyberman ship) or perhaps disguised as buildings in London, (I can think of two) or hidden in bedrooms in London. How many spaceships has Doctor Who discovered in London?

While watching this episode, why did Tzim-Sha wait to take Earth? one of the planets was taken by Paltraki and his crew but this didn't have any effect in the acquisition of Earth later in the episode. There was no point for Tzim-Sha to re-acquire the stolen planet from Paltraki, as he could have...