10 Unluckiest Doctor Who Characters

10. Bill Potts

Overall, Bill Potts had a good time while travelling with the Twelfth Doctor. Sure, being a TARDIS crew-mate means that you'll find yourself in some sticky situations every now and then (and Bill was no exception), but it's not like she was constantly getting friend-zoned like Martha was, or constantly being disrespected like Mickey.

However, her fortunes changed drastically at the end of her arc, where she was subjected to an unbelievable stroke of bad luck that resulted in her grotesque and irreversible transformation into an emotionless robot - also known as a Cyberman.

After being mortally wounded, Bill is transported to the bottom end of a ship that is orbiting a black hole, while the Doctor stays at the top end. At each end of the ship, time moves differently: while recuperating at the bottom, Bill is there for ten years, but for the Doctor, it's only been ten minutes.

At the end of that ten minutes, the Doctor takes the elevator down to the bottom end of the ship, but he's too late: Bill's Cyber-transformation has already been completed.

The Master then comments on how close the Doctor was to rescuing Bill and saving her from this horrific fate, summing up how devastatingly unlucky she really was:

"Ten years you spent up there, chatting. You missed her by two hours."

Basically, if the Doctor had said one or two less words, taken a few less paces, and been just a fraction quicker in getting to that elevator, the time dilation means that he would've reached Bill before she was operated on.

Really takes the phrase "every second counts" to a whole other level, doesn't it?