Pearl Mackie will star as the title character in the new play, BabyDoctor Who star Pearl Mackie will play every character in the world premiere of a new play about the life of a mother in prison. It will run at Brixton House, London, from October 8-31. “Coming home to Brixton to play this fiercely unique character feels right and makes the experience all the more special.” Mackie is best known for her role as Bill Potts in Doctor Who opposite Peter Capaldi in 2016. Her most recent stage role was as Sylvia in Ballet Shoes at the National Theatre from 2024 to 2025.