Doctor Who 10x1 Apr 2026

Bill realizes the fluid is just looking for a way home. She lets go of "Heather," and the Doctor decides to take Bill on as a full-time traveling companion. 2. Why This Episode Matters

This episode sets up the season-long mystery of the "Vault" beneath the university, which the Doctor and Nardole are sworn to protect. Doctor Who 10x1

Bill becomes fascinated by a girl named Heather, who has a distinctive "star in her eye." They find a puddle that doesn't reflect correctly; it is actually a sentient fluid from an alien ship. Bill realizes the fluid is just looking for a way home

It was designed as an entry point for new viewers, explaining the TARDIS and the Doctor’s nature through Bill's inquisitive eyes. Doctor Who 10x1