BBC has released a trailer for next Saturday's episode of Doctor Who: "Heaven Sent."
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...
Check out the sneak previews below.
Doctor Who airs Saturdays at 9 p.m. ET on BBC America.