 After the Judoon tracked their fugitive to the home of Ruth (Jo Martin) and Lee Clayton (Neil Stuke), the Doctor attempted to defuse the situation by escaping to Gloucester Cathedral with Ruth after Lee agreed to surrender himself to the Judoon.After Gat, a representative for the Judoon's contractor from Gallifrey, kills Lee, the Judoon track the Doctor and Ruth to the cathedral, where they discover that Ruth, later revealed to be a previously unknown, to the Thirteenth Doctor, incarnation of the Doctor disguised as a human using a Chameleon Arch, was the one they were hired to find after they decrypted her bio-shielding.After Ruth fends off and sends the Judoon back to their ship, the Judoon with the help of Gat find the Doctor's TARDIS, containing both Doctors, and use a tractor beam to bring it aboard.