I literally watched the Tales of the TARDIS version a few weeks back but as I'm currently watching Season 13 I thought I'd watch the serial again. Just terrific. It's the little things for me like The Doctor going to 1980 to show Sarah what the future will be like if they leave, and the stuff with Marcus Scarman and Lawrence and The Doctor's alien way of dealing with that situation that is. And Gabriel Woolfe creates one of the best villains of all time.