WARNING: This synopsis contains spoilers some may want to avoid.
The BBC have released a synopsis for episode eleven of Series 9 and part one of the series finale, Heaven Sent, which stars only Peter Capaldi. You can read the spoilery synopsis below:
Trapped in a world unlike any other he has seen, the Doctor faces the greatest challenge of his many lives. One final test. And he must face it alone. Pursued by the fearsome creature known only as the Veil, he must attempt the impossible. If he makes it through, Gallifrey is waiting…
Heaven Sent airs on Saturday 28th November on BBC One, with the time to be confirmed later this week.