10 Huge Doctor Who Plot Holes Everyone Overlooks

Series 10 took quite the turn when it revealed that the Doctor was blind. Even more surprising was the fact that he actually stayed this way for a couple of episodes, rather than it being solved with a quick deus ex timey-wimey.

The Doctor's blindness proved to be a right pain in the neck during the climax of The Pyramid at the End of the World, where the Doctor has to enter a four-digit number to escape a lab that's about to explode.

Since he can't see the numbers (and since Nardole is having a nap), Bill Potts is forced to make a dodgy deal with the Monks to restore his eyesight, allowing him to enter the code.

Well, we say "forced", but that isn't actually true. Bill is using a smartphone to communicate with the Doctor during this scene, and since we know that his sonic shades are capable of transmitting video, why doesn't the Doctor send a video feed of the lock to Bill, allowing her to guide him to the right combination?

Well, the answer is... because the writers didn't think of that. Still, it's a great scene, and a great ending to the episode, so at least there's that.