I expected it would be a tough choice among the four, but still I have to comment that, as a child, The Seeds of Doom was my least favorite as I had problems eating lunch after viewing it. Seems funny now but there you have it. Robot is ok but too much of a Pertwee era carbon copy IMO. A good four-parter still all the way but Tom had not started the gothic golden age of the series yet. I like Terror of the Zygons as it is a little dark. But not dark enough to keep me from eating!
Yes, but at that point we take what we can get, no? Lol Seriously for just a minute if I may be so bold, I just found out Zygons/Android Invasion will BOTH be released sometime next year, not just The Android Invasion which of course gets its US/UK release in January. So cool.