The BBC has released a new video introduction to the Series 9 finale of Doctor Who, titled "Hell Bent."
The video features the Doctor himself, Peter Capaldi, discussing how the Doctor must face himself, and possibly sacrifice a very important part of his life.
"It's everything that a series finale should be," Capaldi says.
Check it out below.
Doctor Who airs Saturdays at 9 p.m. ET on BBC.