I loved The Tripods, a BBC series from the 1980s. It was so well done. Gripping story. Lovely actors. And it was canceled on a cliffhanger so I can't in good conscience drag new fans into it. (It was based on books so you can read the books to sort of figure out how it ended, but the show didn't follow the books exactly so that's not fully satisfactory.) At some point I should go hunting to see if there's any good fic.