In this story, Doctor Who goes to the planet Peladon and meets these guys. They're the Ice Warriors, and they've encountered Doctor Who before. Except that was when the show was in black and white. Now, they're startled to find they are green.
They used to be bad guys, with a very strong "murder the humans" agenda. They've gone nice now, though.
Doctor Who is still a total jerk to them regardless. Obviously.
Also on Peladon is this exciting Space Penis. He hangs around with the Ice Warriors trying to be friends.
They are, understandably, making quite an effort to pretend he is not there.
There's one more alien to meet. He is also, perhaps unsurprisingly, green. He's called Arcturus.
He will turn out to be a bad guy - a shock revelation, subtly foreshadowed by him being a hideous combination between a skull and a spider.
He lives in a machine, which zooms about all over the place. It's meant to be so he can breathe the Peladon air, but it might just be that he's exceptionally lazy.
And, I suppose, this way people might refer to him as "The guy in the life support contraption" rather than, "Revolting Evil Spider Skull Face Guy".
Doctor Who is caught messing around with Arcturus's 'Stops Him Dying' machine. Everyone assumes Doctor Who is trying to murder him.
Which is fair. Doctor Who has made no secret of how repulsive he finds all the aliens. Except the Space Penis, of whom he seems curiously fond.
The Ice Warrior thinks that Doctor Who is probably a murderer, and is telling Arcturus and the Space Penis about all the times that Doctor Who tried to kill his friends, back in the black and white days.
Space Penis is drooping with sadness. He likes Doctor Who, and is shocked to find that he once ran around on the moon killing Ice Warriors with guns.
Let's hope he doesn't find out about the time Doctor Who made the Krotons drink corrosive acid and laughed as they melted.
Jo is wondering if she can come and be a companion for the Ice Warriors instead, and do they have their own TV show, and does it involve less sexist, patronising dialogue?
The answer is no.
Eventually Doctor Who teams up with Space Penis and the Ice Warriors, and defeats Arcturus. This means the galaxy is safe, but it's hard to escape the feeling that everyone is still overcome with a kind of ennui as the story comes to an end.
Everyone here seems to be trying to avoid eye contact, which suggests that their "Arcturus is Dead!" party got out of hand, and went to some dark, unexpected places.