Sans has watched as everything repeated over and over again. So has Frisk. Sans gave up a long time ago. Frisk, she still has plenty of determination. They couldn't end the loop on their own. But maybe, they could end it if they worked together? Female Frisk. Possible future Frisk/Sans.

When the cores fall back to Earth, Chell gives Wheatley one last chance, but GLaDOS has other ideas. For science and revenge, she uses him as a subject for the most traumatic experiment she can think of: changing an undying robot into a mortal human. In danger of losing himself forever, Wheatley clings to his identity and races to reverse the change – with lots of help, of course.