10 Most Heartbreaking Doctor Who Moments

10. Graham's Wife

We meet Thirteen's companion Graham O'Brien, portrayed by Bradley Walsh, as he is diagnosed with cancer and falls for his chemo nurse Grace. The two married after his cancer went into remission and lived with her grandson Ryan.

In Thirteen's first episode, an electric tentacled monster attacks a train which the family is on, but they are saved by the Doctor. After this, they take the Doctor to recover at their house where Grace discovers the Doctor has two heartbeats.

In a heroic act later in the episode, Grace faces the monster one last time, electrocuting it and saving everyone. However, the kickback throws her from the crane she climbed down to the ground. She dies in Graham's arms, telling him not to be afraid.

The episode moves to Grace's funeral where Graham gives a moving speech about her life, and revealing Ryan's video we saw at the opening of the episode has been about her, not The Doctor, all along.