In the series 9 episode, "Heaven Sent," - one of my favorites of all time - it is revealed that the Doctor spends 4.5 billion years trapped inside his Confession Dial breaking through an Azbantium wall. He does the same thing for 4.5 billion years and comes out a different person.

I had an idea for a story similar to that - a silly idea, so it might be something like a short story. One chapter, perhaps.

Two different ideas, in fact:

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