Is the 15th Doctor really gone? Jodie Whittaker makes a brief cameo as the 13th Doctor, to warn the 15th Doctor about the dangers of punching a hole in the time vortex. She heads off to not confess her love to Yaz, and the 15th Doctor prepares to blow a hole in the time vortex. The 15th Doctor regenerates at the end of this episode, with his face bursting into light and turning into... Billie Piper’s. And yes, that means that Ncuti Gatwa’s 15th Doctor is gone: Gatwa confirms in this behind-the-scenes video that his era as the Doctor is over.