Just when Ryan, Graham, and Yaz are in extreme danger, the Doctor is whisked away to the realm of the Kasaavin, the “beings of light” who have been killing human spies (and collaborating with the Master). The Doctor finds a young woman named Ada sharing this strange space, and when a Kasaavin arrives to return Ada to her own time and place, the Doctor tags along, discovering that Ada is future computer pioneer Ada Lovelace. The Master also follows, but just when it seems the Doctor is finally at his mercy, Ada proves to be a formidable ally. Ryan, Graham and Yaz come in for a safe landing, thanks to the Doctor being a step ahead of the Master and the Kasaavin, but are quickly singled out by tech billionaire Daniel Barton, whose part in the Kasaavin’s plan is still a mystery. It turns out that Barton wants to hand humanity over to the Kasaavin for a compulsory upgrade, to be delivered to every human on the planet via Barton’s ubiquitous mobile technology. And the Master lets the Doctor know that Gallifrey lies in ruins as a payback for a lie that has been perpetuated since Rassilon and Omega founded Time Lord society.
Cast: Jodie Whittaker (The Doctor), Bradley Walsh (Graham O’Brien), Tosin Cole (Ryan Sinclair), Mandip Gill (Yasmin Khan), Sacha Dhawan (The Master), Lenny Henry (Daniel Barton), Sylvie Briggs (Ada Lovelace), Aurora Marion (Noor Inayat Khan), Mark Dexter (Charles Babbage), Shobna Gulati (Najia Khan), Ravin J. Ganatra (Hakim Khan), Bhavnisha Parmar (Sonya Khan), Andrew Pipe (Inventor), Tom Ashley (Airport Worker), Kenneth Jay (Perkins), Blanche Williams (Barton’s Mother)
Notes: The Master has resumed use of his signature weapon, the Tissue Compression Eliminator, which made its debut alongside the Master himself (Terror Of The Autons, 1971); it was last seen when another incarnation of the Master was trying to “improve” it (Planet Of Fire, 1984). The “knock four times” rhythm that drove a previous incarnation of the Master insane resurfaces here (featured heavily in 2007’s The Sound Of Drums and both parts of 2009’s The End Of Time). Gallifrey was forced into a pocket universe in 2013’s Day Of The Doctor for its own protection at the end of the last great Time War, though a later incarnation of the Doctor visited it in Hell Bent (2015); as it turns out, Gallifrey didn’t stand very long. The real Ada Lovelace went on to develop a correspondence with the real Charles Dickens (a fictionalized version of Dickens met the ninth Doctor in 2005’s The Unquiet Dead; it’s probably safe to assume that they never compared notes about their strange friend with the time-traveling blue box, since the Doctor wipes Ada’s memory of their shared adventure here).
LogBook entry by Earl Green