Doctor Who

The Tenth Planet - S4-E2

Question: What caused the first Doctor to regenerate? Was it old age?

Socks1000

Chosen answer: No, it was the result of the Cybermen's draining Earth of energy to their world, that also affected the Doctor, draining his energy as well, causing him to regenerate.

Also In the episode it's said that his body was wearing thin.

Dan23

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