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There’s a new doctor in the TARDIS — or is there? Ncuti Gatwa’s Fifteenth Doctor regenerated into former companion Billie Piper during the British sci-fi show’s season finale on Saturday.

They threaten the Doctor’s lovely companion, Clara (Jenna Coleman). But don’t get the idea this debut episode, the first hour of a two-parter, is all fright and dread.

‘Doctor Who’ Season in Review: The Doctor Might Be on a New Path Ncuti Gatwa shined as the 15th Doctor. But the long-running show feels at a crossroads as it concludes its latest season.