Doctor Who: Every Doctor's Darkest Moment

Wild Blue Yonder is full of weird, dark moments, from the Doctor's arms being too long, to the giant Doctor and Donna being stuffed into a corridor.

But the Doctor and Donna can't be blamed for the weirdness of the Not-Things and their never-ending quest to learn how to be moving, thinking beings. And yet, they do inspire this mayfly Doctor to do the darkest thing in his three episode stint.

The Fourteenth Doctor marking a salt line at the edge of the universe is his darkest moment because it's literal black magic. The Doctor clearly picked up a thing or two from his adventure at Devil's End!

It might have tricked the Not-Things for a minute, but invoking black magic rites at the edge of reality itself meant that the Toymaker came a-calling. It's yet another example of the Doctor's recklessness causing future problems.