Well, I just completed my time with the first Doctor. For just over three seasons of serials, William Hartnell was the Doctor.
I must say, when I first saw him with Susan, Barbara, and Ian, I thought he was a bit of a dick. But as I got to know him and his sense of humor developed, I found myself dreading the moment of his regeneration. Alas, at the end of The Tenth Planet, it happens. While I did not shed any tears, I do feel the need to have a bit of a grace period before embarking on a new adventure with Patrick Troughton and his companions.
In honor of his memory, I give you: the moment of his regeneration: