Parts: 1 (60-minute)
Writer: Chris Chibnall
Airdate: 05 December 2021
Production Code: n/a

Doctors: thirteenth
Companions: Yaz, Dan

Megalomaniacs of the Week: Ravagers, Grand Serpent
Creature Feature: Sontarans, Daleks, Cybermen, Ood

Story: In her attempt to escape the Ravagers, the Doctor winds up split across three spatial locations simultaneously: one on the Division station, one on Bel's Lupari craft, and one in Williamson's tunnels with Yaz and Dan.

Together, all three Doctors must coordinate to defeat the Sontarans' greatest plan yet, to take advantage of the devastation wrought by the Flux to become the dominant power in the universe.