Olivia Colman played a mother — and thus the form of Prisoner Zero at the climax — in the Doctor Who television story The Eleventh Hour. She also read the audiobook version of The Forgotten Army.
After co-starring with David Tennant and Whittaker in Chris Chibnall's 2017 crime drama, Broadchurch, she appeared as herself in the 50th anniversary story The Five(ish) Doctors Reboot.
She was miscredited as Olivia Coleman in The Eleventh Hour credits sequence.
In 2019, she won the Academy Award for Best Actress for her role in The Favourite, making her one of the few Oscar winners to have appeared on Doctor Who. She was the first to win after appearing in the series.
Edit