Doctor Who: Flux - 15 Huge Details We Just Learned About Series 13

We recently learned about a ton of guest stars who will be joining the Whoniverse for this upcoming series, including Inbetweeners lead Blake Harrison, and former Coronation Street regular Sue Jenkins.

With only six episodes, it doesn't feel like there's room for many more, but apparently, there are still certain actors involved that we don't yet know about.

Here's a rather cryptic quote Chibnall gave to the press:

"Some people [we] might not want to say... I’m sure I’m leaving some people out. Well, I know I’m leaving some people out deliberately.”

Of course, there are some obvious picks here - Sacha Dhawan's Master, Jo Martin's Fugitive Doctor, or even Bradley Walsh's Graham, who has been rumoured to appear in the series. Chibnall could also be hinting at a character/actor we've never seen in Doctor Who before, which is less exciting to speculate about, but still a possibility.

Alternatively, we could be looking at a fan-favourite returning character who's a less obvious pick, like River Song, Donna, Martha, the Tenth Doctor, or BENNI! Okay, maybe not that last one, but still, literally any character can be brought back via a jargon-heavy, sci-fi plot device, so let the speculation begin!