A ship of mercenary police called the Judoon turn up and surround Gloucester. And start killing grannies, as you do – their knitting needles are classed as weapons, you see. The Judoon are space rhinos who have been tasked with finding a particular fugitive for their client.
Captain Jack Harkness then comes bobbing through with warning of a lone cyberman – in an episode yet to come.
And Jodie is fretting about the Master – who’s still out there somewhere.
A black tour guide called Ruth turns out to be who the Judoon are looking for, but her bio-shield allows her to avoid the scans and escape with the Doctor. Turns out (spoiler)… Ruth believes she’s the Doctor (a bit like ‘the black slayer Kendra in Buffy moment’). And Ruth has her own TARDIS. Jodie-Whittaker-as-Doctor gets all confused, believing Ruth to be a future version of herself, but Ruth says she has no memory at all of Jodie-as-Doctor.
There seems to be a split in the timeline. In Jodie’s timeline, Gallifrey has been destroyed… but not in Ruth’s. And the mysterious ‘client’ who’s after Ruth is from Gallifrey!
And that’s the episode. It comes at you from all angles. There are twists and turns – but remains coherent (mainly). It’s the best episode of the series by a good chalk. There are jokes, some terrible acting, the Doctor (Ruth) knowingly using a gun to kill someone, and more. It all works! Hurrah!