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 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,

With season 3 still not confirmed, Doctor Who's season 2 finale underwent major changes, and we have details on what was originally meant to happen...and it didn't include a regeneration or Billie Piper.