Doctor Who The Tenth Doctor #15

Only one question from this year's season finale, and things have never looked more dangerous for doctors and Gabby!

Separately, the old forces from the galactic center, the doctor takes a space trip in the history of the universe, while Gabby should negotiate with unearthly intellect for the sake of the planet!

How much she had learned from his brief visits to the doctor ... and that will be enough to save her?!