The Scars We Leave Behind

The Doctor is dying, but before he goes he needs to figure out why the worlds are collapsing again, and that means enlisting help from his previous regeneration. But it's going to be hard, especially when they discover that they brought it upon themselves. The Doctor has had many companions, and each one has been hurt in their own way. But now, that pain is coming for The Doctor himself and he'll discover that his travels have left an imprint on the universe that could potentially end it all...