10 Doctor Who Cliffhangers That Made You Say WHAT?!
6. The Doctor Is Still Blind (Oxygen)
This terrific Series 10 episode centres around a space station and the value of oxygen among its crew members. So they called the episode "Oxygen". Very apt.
We see the Twelfth Doctor, Bill, and Nardole come up against zombies in spacesuits (what is it with Steven Moffat and killer spacesuits with a mind of their own?) and also the inhumane values of a company which places profit above human life.
This episode has a few near-fatal moments that give you a bit of a fright, including Bill’s suit malfunctioning and the Doctor giving her his, the Doctor going blind as a result of his prolonged lack of oxygen, and then Bill’s suit malfunctioning for a second time, seemingly killing her! Thankfully, the Doctor is able to save Bill, and Nardole is able to restore the Doctor’s vision… or so we think.
In a shocking twist at the very end of the episode, the Doctor reveals that he “Can’t look at anything ever again!” because he is, in fact, still blind. It's incredibly rare for the Doctor to suffer a serious injury like this, and it left us with a lot of questions heading into the next episode.