It's hard to ignore the fact that in the credits of <em>Doctor Who</em>'s "The Reality War," it just says "Introducing Billie Piper," and doesn't explicitly state who she's playing. While it seems obvious she is the Doctor, considering one minute Ncuti Gatwa was standing there and the next Billie Piper appeared, there's a good chance she could be the Bad Wolf again. Perhaps she's even the Moment, like in the 50th anniversary special, instead. I hope there's more to it than her just being the Doctor, though.