Gat

 was a Time Lord who worked alongside the Doctor (TV: Fugitive of the Judoon) for the Division. (TV: The Timeless Children)

Biography
Like all Time Lords, Gat was taken from her family at the age of eight for the selection process in the Drylands. Staring into the Untempered Schism as part of a Time Lord initiation rite, Gat was inspired by what he saw in the Schism (PROSE: A Brief History of Time Lords)

Gat subsequently worked with the Judoon to capture the Fugitive Doctor following their disappearance, and upon discovering the Doctor's location, she executed Lee Clayton, the Doctor's "companion". When she captured the Doctor, Gat was surprised to also be confronted with another incarnation of the Doctor. When she later revealed to the other Doctor that she was an agent of Gallifrey, Gat was horrified to find that Gallifrey was gone in her time, destroyed by.

Gat was killed when she tried to shoot the Fugitive Doctor with a laser rifle, as the Doctor had re-calibrated the weapon to shoot the one holding it. (TV: Fugitive of the Judoon)