According to Millie Gibson’s CVs for both her agency and Spotlight, she stars as companion Ruby Sunday in a Doctor Who episode directed by Mark Tonderai.

Tonderai directed the Series 11 Doctor Who episodes The Ghost Monument and Rosa.

Rosa was a Hugo Awards finalist for Best Dramatic Presentation, Short Form.

Tonderia was quoted in The Guardian on the casting of of Ncuti Gatwa.

“I think it’s fantastic this kid has got there. He’s got real charisma. I just hope they lean into his experiences. Because the way I interface with the world and the way a white person interfaces with the world is going to be different. That’s just a fact. Certain things are different for us. So, for me, there’s no point having a black Doctor who might as well just be white. There are opportunities to expand what happens on the show now. I’m not talking about navel-gazing discourses on race – this is Saturday evening family viewing. But I am saying that the discourse can be deeper if we want it to be.”

According to Doctor Who Magazine, director Dylan Holmes Williams is directing the current filming block. It is yet unknown why Williams is not listed on Gibson’s CV.

The first full episode of Doctor Who starring Ncuti Gatwa as the Fifteenth Doctor and Millie Gibson as Ruby Sunday will air during the festive period after three Doctor Who 60th anniversary specials starring David Tennant as the Fourteenth Doctor and Catherine Tate as Donna Noble air in November 2023.