DW Monsters: Androids

Following Terror of the Zygons, the next two stories are:

• Planet of Evil – the anti-matter monster here is an apparently unique entity and, in any case, is more a sort of mobile hazard than something with creature statistics
• Pyramids of Mars – although we only encounter one Osiran, they are a race… however, they’re sufficiently powerful that they are more effectively described as one-off NPCs. I’m also going to pass on their servitor robots for the time being as there isn’t much to say about them other than them being large, strong, robots.

This brings us to The Android Invasion. The alien race here are the Kraals, which have leathery skin, sculpted skulls, and a small nose-horn. Other than their physical appearance, however, there seems little to set them apart from humans, and in game terms they (as with races such as the Draconians) probably don’t need any particular rules. Their titular android creations, however, are a different matter. 

DW Monsters: Skarasen

The next story up is Terror of the Zygons, the only classic series appearance of the eponymous aliens. While I have done those before, as a recurring race in the modern series, the story also includes the Zygons' pet monster, the skarasen. Considering that we're told the creature is essential to Zygon survival, it's noteworthy that it has not appeared again on TV in any subsequent stories involving the race. 

The spin-off media, however, have been more willing to include them. They have so far appeared in two of the licensed audios (and one older one, outside the regular license) and two novels. The most significant of these is probably the Eighth Doctor novel The Bodysnatchers, which features a batch of infant skarasen. Each of these stories has, naturally, also included the Zygons; there have been many Zygon stories without the skarasen, but never the reverse.