The period drama, which follows a group of London midwives in the 1960s, was renewed for a sixth season last week.
The Christmas special will see the girls of Nonnatus House in 1960, as they prepare for a local televised carol concert. The series stars Miranda Hart, Jenny Agutter, Pam Ferris, and Judy Parfitt.
Here’s the episode description and promo:
As celebrations swing into action, Poplar readies itself for Christmas 1960; a festive bus trip to see the Regent Street lights and a visit from a BBC film crew promise to make it a Christmas to remember. But it’s a difficult time of year for grieving mother Iris; bringing back memories of her long departed baby daughter. And at Nonnatus, things are tense as Sister Monica Joan determines to bring the Christmas spirit early, despite Sister Evangelina’s disgust. As the community pull together to prepare for the televised carol concert, Nonnatus is rocked when Sister Monica Joan goes missing.