As the planet faces destruction, Maaga launches a final attack on the Rill base. The Doctor offers to transfer power from the TARDIS to the Rill ship so that it might escape.

Five 'mass extinctions' have decimated our planet since it was formed - now scientists claim the answers to two could be ...

For now, Earth remains safe from the destructive power of exploding stars ... have shaped the history of life—and death—on our planet.