Here is a round-up of my blogging about the earliest seasons of Doctor Who, as originally portrayed by William Hartnell.
An Unearthly Child (continued in 100,000 BC and The Firemaker)
The Daleks’ Master Plan (see also my post “Thutmose and Hyksos Discuss the Gods“)
The Massacre of St. Bartholemew’s Eve
William Hartnell also returned to portray the First Doctor in The Three Doctors.