The season finale of Doctor Who, ‘The Reality War,’ was shocking for many reasons. However, the biggest surprise involved an appearance by actress Billie Piper, who played Ninth and Tenth Doctor companion Rose Tyler.

Doctor Who fans across the world were gagged on Saturday night when Billie Piper made an unexpected return to the franchise. After weeks of speculation about whether Ncuti Gatwa’s time as The Doctor was coming to an end in the not-too-distant future,

Doctor Who star Ncuti Gatwa has quit the show and passed his Time Lord baton to Billie Piper — but fans believe all is not what it seems. This weekend's season finale saw Gatwa leave the BBC's big sci-fi show after 18 episodes in the title role,