Overview
- Part one airs at 8:15pm on Christmas Day, with part two at 8:30pm on Boxing Day on BBC One.
- The festive storyline sends the Nonnatus team to Hong Kong after a landslide and building collapse prompts a mercy mission.
- Parallel Poplar plots include an unexpected request for Cyril, a Christmas gathering hosted by Rosalind and Joyce, and Sister Catherine assisting two Irish traveller mothers-to-be.
- Returning cast members include Jenny Agutter, Helen George, Stephen McGann, Laura Main, Linda Bassett, Annabelle Apsion and Cliff Parisi.
- Creator Heidi Thomas recounted that filming in Hong Kong faced escalating typhoon warnings that forced the cast and crew to shelter.