Parts: 1 (60-minute)
Writer: Russell T Davies
Airdate: 09 December 2023
Production Code: n/a

Doctors: fourteenth, fifteenth
Companions: Donna, Mel

Megalomaniac of the Week: the Toymaker
Special Guests: UNIT

Story: Arriving back in London, the Doctor and Donna find the city in flames, and an argumentative populace taking to the streets. After being quickly escorted to UNIT HQ, Kate outlines the dire situation: nearly all of humanity has had their brainwaves altered by a mysterious signal, heightening individualism and paranoia, with every person believing — and violently insisting — that only their opinion is the correct one. As humankind turns against one another, even UNIT seems powerless to prevent the carnage.

But the Doctor suspects some malevolent influence, and — with UNIT's help — traces the origins of the signal back to Soho in 1925, where inventor John Logie Baird has just transmitted the first television signal using a ventriloquist's puppet named Stooky Bill. But where, the Doctor wonders, did Stooky Bill come from? The answer: an old-fashioned toy shop, with a proprietor who seems to know the Doctor of old...