Jorj was one of fifty skeleton crew members aboard a colony ship, travelling from Mondas to pick up colonists. He was a janitor. When the ship almost traversed into a black hole, around twenty crew members were sent to the bottom of the ship to reverse the rear thrusters. They were never heard from again.
Shortly after, a group of patients ascended from the lower decks and took the rest of the humans away. Jorj, the only non-human member of the crew, attempted to fight them but they overpowered him, being left behind.
Two days later, Jorj discovered the arrival of Missy, Bill Potts and Nardole aboard the ship’s control room. He spoke to them over a monitor from a back room and advised the group to stay where they were. Entering with a gun, Jorj asked if the group if there were any humans present among them. Three inertia lifts began ascending from the lower decks containing patients. Bill admitted that she was the human and Jorj threatened to kill her. As The Doctor tried to negotiate, the lifts arrived and Jorj shot Bill.
After Bill’s body was taken away by a group of Patients, he explained what had happened to Jorj’s crewmates: time dilation. The Doctor, after deducing the time dilation with floor 1056 and their own, used Venusian aikido to incapacitate Jorj, and he, Nardole and Missy descended to the decks below. (World Enough and Time)