So these are the Tereleptils, and I’ve always thought they were good-looking monsters. They made the interesting, and probably correct, choice, to give the one with the full animatronic mask the additional detail of being horrifically scarred and missing an eye. This unfortunately limited the aliens from ever returning to the show, because they’d have had to start from scratch and rebuild an entirely new head. Otherwise, you’d have dialogue like “You know, I met one of your species on seventeenth century Earth with wounds exactly like yours…”
Actually, they did reuse one of the non-animatronic heads for another alien that made a fleeting appearance in a story four seasons down the line. Perhaps they thought nobody would notice.
Fans and writers have thrown a lot of criticism at the producer of the show throughout the eighties, John Nathan-Turner, and as the program starts getting complacent and annoying – very soon now – I’ll have a lot to say about what I see as some very poor decisions. But let’s give him a round of applause for having that Tereleptil blow up the Doctor’s sonic screwdriver in part three of the story. Nathan-Turner believed that writers were using the device as a crutch instead of coming up with clever and inventive ways around problems. So when the screwdriver explodes, Marie told our son – who’s only seen the latest four episodes of what we call “the modern show” (and enjoyed them very much) – not to worry, that the Doctor can build another. But the beautiful thing is, he doesn’t, not for years.