Why We Fight

Why We Fight is the fourth episode of the Common Series, and the first of a two-part story.

Synopsis
"Why are we fighting to save a planet that wants us dead? - Amy Pond

The TARDIS lands on the planet Atorva in the far future, where The Doctor uncovers a government plot to sacrifice the population to the god-like Skarkish. Meanwhile, Amy and Rory discover just how devoted the Atorvans are to their religion, and are hunted across the capital by the very people they're trying to save. Can The Doctor unmask the Skarkish plot to re-shape the universe? Will anyone survive the Purge? In the midst of a war where everything is on the line, only one thing is certain: Silence will fall.

Cast
The Doctor - Matt Smith Amy Pond - Karen Gillan Rory Williams - Arthur Darvill Zoah Magamba - Tom Hollander Skarkish Voice - Chow Yun-Fat