Call the Midwife — Characters & Cast

Initially the straightforward fulfilment of a religious vocation: to serve the poor of Poplar without judgement. Over the seasons this deepens into something more institutional and more anxious — preserving Nonnatus House so that the care can continue after her, and protecting her staff from the moral costs of the work.

Introduced as the calm Sister-in-Charge who inducts a sceptical young nurse into Poplar, she becomes the series' fixed point — Jenny Agutter is one of the very few performers to appear in every season from 2012 onward.

Her long arc is one of increasing administrative burden and decreasing certainty: she must keep the House solvent, negotiate with the NHS and local authorities, absorb bereavements including the loss of her closest sisters, and steer an ageing religious order through a decade that no longer needs nuns in the way 1957 did. Where she begins as the answer to other people's crises, she ends as someone who must be held up herself.

Early on, simple appetite — for cake, for argument, for the astronomical and the divine. Later, the far harder motivation of remaining herself: to stay in the House, to still be consulted, to die among the women who know what she once was.

The order's grand old woman, presented as one of its pioneering midwives and bound up with the House's own origins, she begins as comic relief with a sweet tooth and a habit of quoting poetry mid-crisis.

Across fifteen series she becomes the show's memento mori. Her lapses into confusion, her fear of being sent away, her stubborn refusal to be managed and her flashes of piercing lucidity turn her into the emotional register for ageing, dementia and the value of a life that can no longer be useful. Judy Parfitt, like Agutter, has been present since the first series.

Begins as duty mixed with guilt — the sense that he owes Poplar more than he can give. Matures into a conviction that prevention beats rescue, and later into a father's and husband's desire to protect a family built out of second chances.

The overworked local GP begins as a widower carrying private grief and a caseload no one man can meet. His marriage to the former Sister Bernadette — Shelagh, played by Laura Main, another every-season cast member — reshapes both characters and gives the series its most durable domestic partnership.

Professionally he evolves from a doctor patching up the consequences of poverty into an advocate who uses the NHS as a tool: pushing vaccination and screening programmes, confronting the fallout of the thalidomide scandal, and adapting to a medical culture that increasingly questions the authority of men like him. His arc is the slow conversion of anger into policy.

Initially the pursuit of a life bigger and brighter than the one available to her — escape through romance and style. This transforms into a need for self-respect and sobriety, and finally into solidarity: using the security she has gained on behalf of women who have none.

Arriving as the fashionable, quick-witted nurse who treats Poplar as a posting rather than a calling, Trixie is the character the series has spent the longest time deepening — Helen George has appeared in every season since 2012.

Her long arc moves through romantic disappointment, a private struggle with alcohol that the show handles as illness rather than scandal, and a gradual assumption of seniority and authority within Nonnatus House. By the fifteenth series, set in 1971, she is at the front of a Women's Liberation march, burning her bra outside the House — the fully politicised endpoint of a woman first introduced worrying about her lipstick.

As a young woman, escape from an unhappy past and the desire to be good at something. As narrator, the obligation to record: to keep the names, faces and injustices of a demolished East End from disappearing along with its buildings.

Based on Jennifer Worth, whose memoirs the series adapts, Jenny is both the young nurse who arrives at Nonnatus House in 1957 and the unseen older woman remembering her. Vanessa Redgrave's narration frames the show from the pilot onward.

Her arc is unusual because it is completed off-screen: within the story she is formed by Poplar and then moves on, while as narrator she persists long after the on-screen character has gone, continuing to speak for the world the series depicts. The narration outliving the character is the show's structural statement about testimony — the work ends, the witness does not.