Who played doctor 8on Doctor Who?

There is no Doctor 8 in Doctor Who. The Doctor has had 14 actors play the role, and the current Doctor is the 14th.

If you're thinking of a specific Doctor, could you please provide more information? For example, you could tell me:

* The Doctor's name: For example, "the Doctor who regenerated into a woman" (this would be Jodie Whittaker)

* The approximate time period: For example, "the Doctor who was on TV in the 1960s" (this would be William Hartnell)

* Something unique about the Doctor: For example, "the Doctor who had a sonic screwdriver" (this could be any of many Doctors)

With more information, I can help you identify the Doctor you're looking for!