I celebrated Doctor Who Day by watching the story that introduced me to the series, The Invisible Enemy. It's been a good many years since I saw it, so to a certain degree it was like seeing it anew. It's not hard to see why I found it so appealing: it's completely crazy. A virus that is transmitted via lightning bolts shot from the eyes! Miniaturized clones wandering through someone's brain! A talking robot dog! And what twelve-year-old boy doesn't like things that are completely crazy?
Looking at it with an adult's eyes and with an adult's critical standards, I don't know that I would necessarily call it "good" in the traditional sense of the word, but it's still a lot of fun. And it's remarkable the degree to which, by the end, I was looking past the cheesy effects. Also it had a hot woman running around in a very low-cut leather minidress, which is an aspect I didn't fully appreciate back in the day. All in all, a pleasant way to pass 90 minutes or so. But don't take my word for it: watch it for yourself.