I just watched "The Web of Fear". Poor Patrick Troughton! So many of his episodes are lost. The outstanding sets, music, sound effects, and overall grim outlook through most of the show must have made these episodes one of the reasons Doctor Who gained a reputation for chasing children behind the couch in fear.
One of the most impressive things about this production is the amazing quality of the London Underground sets. They were so realistic that the BBC received calls from people complaining that there shouldn't be people filming in the underground..
On an unrelated note, I watched
The Time Meddler again on Sunday night. One of the better Hartnell stories.