Ka Faraq Gatri

"Ka Faraq Gatri" was an epithet which was applied to the Doctor by the Daleks which translated as "Destroyer of Worlds". (PROSE: Timewyrm: Revelation) or possibly, "Nice guy, if you're a biped". (PROSE: Continuity Errors)

The Doctor was aware of this as early as their second incarnation. (COMIC: Bringer of Darkness) He had been awarded the name upon orchestrating the destruction of the Dalek home planet Skaro in his seventh incarnation, (TV: Remembrance of the Daleks) though the Daleks also used it prior to Skaro's destruction. (COMIC: Bringer of Darkness)

It was used once again by the Thirteenth Doctor. (PROSE: The Terror of the Umpty Ums)