OMG, I used to be a TOTALLY hardcore Whovian. Way beyond sense and sensibility, worse than any Trekkie. lol.... I've seen every Dr Who episode that still exists to be seen, except for the new ones (Eccleston, you say?). But my brother downloaded those from the net, and he said he'd burn me some copies of them; I just keep forgetting to give him the blank disks when he's here in town. Heck, I've even seen the ~original~ Dr. Who movies, the non-canon Brit ones with Peter Cushing as The Doctor. I was a veteran con-goer, and eventually helped run two local British sci-fi fan conventions (even got to have dinner with Colin Baker, before the first one... lol.... Had breakfast with Danny John Jules, the guy who played "Cat" on Red Dwarf, after the second one) back in the 90's.
For me, Tom Baker was the "only" Dr. Who, although I liked them all (even the one from the USA movie. Yes, I know, that makes me a heretic, but what-the-heck.) Colin Baker was my second favorite Doctor, although I am not exactly sure why.
But I'm afraid I have to prove my Official Whovian Geekdom here -- you've got the wrong spider episode. The one you are talking about, with Sarah Jane and the Jon Pertwee regeneration, was not the one with the spiders that bit people and turned them into Swamp Things. (lol) THAT one was a later Tom Baker episode, titled "Full Circle," and the woman who got bit was Romana, his only Time Lord Companion. She didn't turn into a swamp thing, but she did get this wierd glowy green mark on her face, and she did run off and cavort with the swamp things and help them invade the "human's" space ship. And The Doctor ~did~ save her in the end, so that turned out all right. This episode was, in fact, the first Adric episode.
So yes, I was a total Dr Who geek.
xd I've since recovered, but all that information was burned into my permanent hard drive back then and seems to be uneraseable.
wink