For these polls, I generally limit myself to my top 3 choices, but since this one had so many options, I doubled it to 6 and went with:
The Invasion
Doctor Who and the Silurians
The Daemons
The Green Death
Terror of the Zygons
The Seeds of Doom
These polls are super fun; however, I do have one question: where’s Inferno?
At the time this poll was made, polls were limited to 20 options, so I couldn’t squeeze everything in, and I may have forgotten a serial or two as well. And, of course, you can’t modify polls without losing all the votes…
No worries, I completely understand. 
I was all set to immediately vote for it and thought for a moment I just missed it, that’s all. The work you and others put in here is to be commended, so please don’t mind my little nitpick, haha.
Thanks!
Though I think this poll actually predated me being a moderator here…