The Stenza warrior, known as Tim Shaw/T’zim-Sha by the Doctor and her companions, made his return as a world-stealing false god harboring bad intentions.
Doctor Who closed out Season 11 with the return of a familiar and not particularly lovely face, and also not one that’s been seen in previous seasons.
Fortunately, Graham and Ryan were able to lock him in a stasis chamber, although it’s up for debate whether or not they really succeeded in stopping him indefinitely.