Yasmin Khan

Yasmin Khan is a probationary police officer in Sheffield, stuck writing up parking disputes and itching for something to actually matter. Sharp, restless and quick on her feet, she's first to investigate when strange things start happening on the trains — and first to volunteer when a stranger calling herself the Doctor needs help.

Mandip Gill plays Yaz with a copper's instinct for noticing what others miss, grounding the show's cosmic chaos in someone practical and unshowy. The writing starts her as an underestimated professional rather than a wide-eyed tourist, and that competence — steady, curious, quietly brave — makes her easy to trust from the first episode onward.