Okay, I don't remember this one much, it kinda melds with the other 'weird shit in space' First Doctor episodes so this probably won't be terribly interesting. Not that I imagine the prewatches are interesting for you all in general but whatever they beef up my buffer and the sheer amount of fun that is to say makes it worth it.
Weird shit happens and they're in space.
So, not a historical episode.Â
I don't think it's a future episode either, technically?Â
By which I mean it's an alien episode, and not a space episode with humans who aren't Ian or Barbara.
The Sensorites are the alien species.Â
Also I'm pretty sure they're psychic too.
There might be another alien species who are being harassed by the Sensorites.
Ian and Barbara continue not making any active effort to return home.
Susan does some pretty significant psychic things involving acting as a psychic go between for the Sensorites and...other people.
That last one might not be in this serial BUT I KNOW IT HAPPENS EVENTUALLY.
Although come to think of it I don't think the Doctor does anything psychic related at all.
Okay I'm just doing obvious things now that I don't actually think I'm remembering so I'm gonna stop here.