Khan encountered the Thirteenth Doctor and Ada Gordon, who had been transported through time by the Kasaavin. She allowed them to hide under the floorboards in her apartment while the Master's Nazi officers searched for the Doctor.
Khan briefly travelled with the Doctor and Ada to Britain in 2020 (whereupo Team TARDIS, her regular companions, asked if they were "being replaced") before being returned to her own time and having her memories of the Doctor erased. (TV: Spyfall) Graham O'Brien later discovered that Khan, betrayed to the Nazis, "didn't live to see the end of the War". (PROSE: History's Finest)