Doctor Who: The Twelfth Doctor: The Hyperion Empire Part 3

THE STARS GO OUT, ONE BY ONE! It's the penultimate part of 'The Hyperion War', and things are looking bad for the Doctor and Clara! With the returning Hyperions having laid waste to whole portions of the Earth, the Doctor attempts to regain the initiative by moving the battleground into space, aboard the Hyperions orbital armada... But these ancient solar entities are building a superweapon around the sun - and eternal darkness could be the result!