Doctor Who: Hell Bent - Official Synopsis.

The BBC has released the official story synopsis for Hell Bent, the twelfth and final episode of Series 9.

Spoilerphobes may want to avoid!

If you took everything from him, betrayed him, trapped him, and broke both his hearts…how far might the Doctor go?
Returning to Gallifrey, the Doctor faces the Time Lords in a struggle that will take him to the end of time itself. Who is the Hybrid? And what is the Doctor’s confession?

It premieres Saturday 5 December, 8pm to 9.05pm on BBC One.