Should I know?
It would take you at least 30 years to catch up. You could start by Googling him.
The Good Doctor is a Time Lord (with two hearts), from the planet Gallifrey, now almost the last of his kind after the planet's destruction in the Time War with the Dalek Empire. He is a temporal regulator who travels in time around the Universe in his TARDIS which is disguised as a blue London Police Call Box. Watched over by The Guardians of Time, the Time Lords live thousands of years and regenerate in a new body if they experience corporal death. Dr. Who has an affinity for humans and has traveled with human companions. Most of us old timers have seen around seven or eight generations of Doctor Who, beginning with reruns on PBS of Jon Pertwee(popular actor Sean Pertwee's dad).
In the 80's there was a DW tour in the US. It was in a trailer that parked at the stations where DW was airing.
Mrs p6 and our kids treated me to a visit at the WQED studios in Pittsburgh. Baker had been replaced by Peter Davison who did not make a good Doctor, at least to me back then.
Now I like them all. Eccleston, Tennant and Smith have been wonderful.
Really it's the perfect concept for a timeless series. Each Doctor reboots with new personality.
A few years ago the question of limited regeneration was debated in the DW community with the consensus being that there actually can be more than 9 or 12 regenerations. Sadly I don't recall how it was worked out.
A week or so ago BBC had a couple of the earliest episodes, one about a Dalik hibernation temple and another about the Mayans, of course both were in black and white. I really enjoyed them, I heard many of the original 1960 era episodes sadly are lost, it would be historical if for some reason they were found, restored and optionally digitally remastered and colorized on Bluray discs.
Like the remastered Star trek series which was very well done.
I will watch Doctor Who even if its over 40 years old and in black and white before I become a fan of the stupidly directed series “The Walking Dead” of which occasionally has a thread here on FR, beware the thread is guarded by a fanatic that won’t tolerate common sense discussions.