It's another adventure for The Master. This week he's in a car, telling this woman what to do.
She looks like this always happens to her, and she's sick of it, and the second she gets home she's going to blog about this under #everydaysexism.
Hurray! It's Sergeant Benton. He's got a giant missile to look after. He's telling this guy that the missile absolutely must not, under any circumstances, get stolen by evil aliens.
The look on his face suggests that he has been trying to explain this for quite a long time, with limited success.
After about twenty minutes, The Master has stolen the missile.
He is delighted. He's also got a magic box which makes people see their worst fears. And a cigar!
He's having a right old time.
A lot of this story happens in a prison. There's an evil machine which is full of Evil, and that's The Mind of Evil. Possibly. It's not really made explicit. But the machine drains Evil from people's brains, and turns it into... fear? I think. It's all a bit abstract.
Anyway, the upshot is that there's this little cute machine thing and it zips about the prison making people go "Arg!" in the head.
Like this guy. He was going to shoot The Mind of Evil, but now he's just having a terrible time inside his own brain.
Doctor Who finds out that The Master has stolen a missile, and taken over a prison, and made a Mind of Evil happen, and of course he's furious about all these things.
He's shouting at The Master, saying "Stop doing so much Evil!" and "What is wrong with you?"
The Master does not stop doing evil, and instead locks Doctor Who and Jo up in a cell. Then he stays with them, and annoys them by talking all the time about how ace he is while they are trying to play draughts.
Doctor Who is not worried. He knows that The Master's plans are always stupid, and never work, so all he has to do is wait until The Master is running around panicking and crying for help.
Sure enough, the Mind of Evil goes mad and everything goes wrong, and The Master has to come to ask Doctor Who for help. They make friends for a bit, and make The Mind of Evil explode.
But then The Master runs off, laughing, as if he had won.
You haven't won, The Master. Look - your Mind of Evil is on fire. Idiot.