In a BBC press release, when asked for three words to describe the six-part series Doctor Who: Flux, Jodie Whittaker chose “self-discovery rollercoaster.”

“From where we’ve left her, I think self-discovery is the biggest journey the Doctor goes on this series.”

“It’s bigger and better than ever, it’s my final (full) series, there’ll be questions asked, there’ll be answers, there’ll be exclamation marks, and huge exclamation marks and I think that in itself will pique your interest and pique your curiosity.”

Co-star Jacob Anderson (Vinder) described how the Doctor’s self-discovery journey informed Jodie Whittaker’s performance.

“I think Jodie does such a wonderful job; she does things with the character that are subtler than she gets credit for sometimes. She puts so much pathos into this alien. The Doctor can sometimes be quite clownish, skittish and jumpy and that’s really a part of the charm that she can do that, but she also has the tragedy of their life and it is all contained in it. She plays it in a really beautiful subtle performance, I really enjoy her Doctor.”

Showrunner Chris Chibnall hinted at how the Doctor’s history will be explored when he described his choice of monsters for the series.

“I think you’re always thinking ‘who is interesting for the Doctor to come up against? Who is going to reveal new things about the Doctor?'”

“[The Ravagers] are a couple of characters who we meet, who are creatures of another dimension who have a history with the Doctor – but I even think with this I am giving too much away!”

Producer Matt Stevens also hinted at the Doctor’s journey this series.

“[Doctor Who: Flux] picks up on a lot of the things the Doctor learned about herself and her history at the end of series twelve.”

BBC America, in conjunction with AMC Channels, released a promotional summary of Doctor Who Series 13 via Deadline.

“She’s back. The Thirteenth Doctor is returning for the thirteenth series in what is set to be a six-part Event Serial. Since their last epic battle in Revolution of the Daleks, the Doctor and Yaz have been exploring the universe together but with the Doctor now questioning everything about her past there she will undoubtedly be searching for answers.”

Written by Chris Chibnall and directed by Jamie Magnus Stone, the first chapter of Doctor Who: Flux, The Halloween Apocalypse will will air 31 October on BBC One at 6:25pm BT and on BBC America at 2:25pm and 8pm ET.