Season 7? Probably my favorite third Doctor season. It's Pertwee when he was still trying, UNIT when it hadn't become a farce and a companion, Liz, who is much better than her replacement. "The Silurians" and "Inferno" are fantastic stories, "Spearhead from Space" and "The Ambassadors of Death" are very good too. What's not to like about season 7?