https://www.radiotimes.com/tv/sci-fi/doctor-who-dot-and-bubble-ending-showrunner-wary-newsupdate/
It was Ncuti Gatwa's first day as the Doctor.
Much of her lousy behavior I immediately just chalked up to being a childish brat. And I figured her being nicer to Ruby because she’s easier to identify with as a young, hip, pretty girl. (I was so close to the truth…) Everything else past, including irritating with The Doctor, I just lumped into the unfolding insanity that started as soon as he first showed up.
The only part I wasn’t immediately sure about Ricky/“white Doctor” and how he fit into the whole story. I guess I expected some kind of eventual betrayal, just… not in the way it happened…
Man… I’ll be thinking about this one for quite a long time, I think. :)