A great Patrick Troughton gem from the so-called Monster Era(Season 5:1967/68) which introduced viewers to the inhabitants of Mars- The Ice Warriors. This was the same season they did stories about the Yeti, the Cybermen, and some other stuff.The Ice Warriors also appeared in "The Seeds of Death" and "The Curse of Peladon".
Well it was nothing...I just happen to have grown up literally watching Dr Who. I first saw it as a five year-old in 1982 on a schoolnight.Tom Baker was the one I saw then and remains my favorite to this day. The earliest ones- which you happen to be watching -are ones they never showed here due to different story lengths and not 'suitable' for children. Of these the only ones I saw were An Unearthly Child and Planet of Giants.
If you see Rememberence and Curse of Fenric you really aren't misisng much by cutting out those later Sly McCoy episodes... there's Ghost Light, but that's only 3/4s of a good story.
The Ice Warriors were in the Monster of Peladon as well, of course. Easy to forget, though, because as in keeping with its programme code, YYY was this story ever made...