As we ponder just who Billie Piper could be playing now (oh, we have theories ), below, we take a look at 10 episodes (all streaming on HBO Max) you should watch now that she’s back on Doctor Who. This episode and one word (“Run”) are what started it all.

Ncuti Gatwa's Doctor Who exit brought back a familiar face to the TARDIS, but didn't explain how and why Billie Piper returned to the show.

With Doctor Who’s explosive May 31 series finale majorly hinting at Billie Piper taking on the iconic role of the Time Lord, fans may be stunned at what the actress once said about women playing the famous protagonist.