Blackout/All Clear

Oxford time-travel historian recovering in a convent hospital after Dunkirk, obsessively monitoring war news to confirm he has not altered history, and strategizing how to contact the retrieval team now that he knows he is in Orpington rather than Dover.

Oxford technician controlling time-travel drops; Polly concludes he is likely dead given the complete failure of rescue operations

Oversees historian assignments; obsessively protective of his historians; absent in London when urgently needed by both Mike and Eileen.

Seventeen-year-old who assists Polly's Blitz research; romantically devoted to Polly; scheming to travel real-time to close their age gap.

One of the feral Hodbin evacuee siblings; catches Eileen attempting a secret nighttime exit and is reassured before departing with Eileen to London.

A well-behaved child evacuee in Eileen's care whose mother is delayed; he shelters alongside Eileen and the Hodbins during the first Blitz raid.

Works at the Oxford time-travel lab under Badri; gives Colin information about Polly's retrieval schedule.

Mike's colleague preparing for a Singapore assignment; exchanges banter with Mike about the dangers of their respective projects.

Historian caring for evacuees at Backbury manor, trapped by repeated measles outbreaks and a non-opening drop, growing increasingly certain something has gone wrong with her retrieval.

Oxford historian working undercover at Townsend Brothers department store during the Blitz; her drop is broken, her entire boarding-house shelter community has been killed, and she has an undisclosed personal deadline that makes her entrapment potentially fatal.

Returns to Backbury after the quarantine ends, her son having enlisted in the RAF, and sets the staff to learning first-aid manuals.

Housekeeper at Backbury who monitors staff behaviour and lectures Eileen about propriety.

Staff member at Backbury who contracts measles late in the quarantine, further extending Eileen's entrapment.

Barmaid at the Crown and Anchor inn in Saltram-on-Sea; sociable and flirtatious, provides Mike with local transport information.

Elderly commander of the Lady Jane who pilots it into Dunkirk harbor, scolding Mike's landlubber vocabulary while relying on him to navigate obstacles.

Hostile shelter regular who publicly accuses Polly of trying to steal a newspaper, establishing herself as a social opponent.

Clergyman sheltering in the tube cellar; mild-mannered, attempts to defuse Mrs. Rickett's hostility toward Polly.

Young woman who shelters with Viv; discusses film stars and tips Polly about a job at John Lewis; runs up to tell Polly the store was bombed.

Young woman paired with Lila; voices panic during the severe raid and shares in the post-raid banter with Sir Godfrey.

Dog owner who brings his terrier Nelson to St. George's because dogs are not allowed in tube stations; reports RAF aircraft counts nightly.

Historian embedded in a FANY motor ambulance unit in June 1944, monitoring for V-1 rocket reports and accidentally standing out by possessing fine-quality dresses from Wardrobe.

Young FANY officer at the Dulwich post who welcomes Mary and scrambles to look professional before the Major arrives.

Sardonic, pragmatic FANY who dismisses air-raid alerts as pranks, discusses wartime romance, and is tackled by Mary just before a V-1 detonates.

FANY who responds to V-1 incidents and returns with reports of flattened houses, still misidentifying the rockets as crashed planes.

Commanding officer of the Dulwich FANY post; small and slight, announces the unit's reassignment to transport Normandy wounded rather than the expected V-1 news.

Historian embedded with a wartime women's unit on VE Day eve, navigating celebratory crowds while managing foreknowledge of exact historical outcomes and trying to reach her drop.

Confident, decisive young woman traveling with Douglas and Paige to London for VE Day celebrations; propels the group forward despite Paige's doubts.

Anxious, hesitant young woman accompanying Douglas and Reardon; repeatedly questions whether the war's end is a false alarm and is engaged to a man not present.

FANY companion obsessed with a pink net frock and openly envious of Mary's high-quality dresses.

Sardonic FANY who names the unattractive shared frock 'the Yellow Peril' and rolls her eyes at Camberley's excitement.

FANY who polishes her nails and jokes that Mary must be having an affair with a rich American general to own such fine clothes.

The Commander's grandson crewing the Lady Jane; excitedly informs Mike they have arrived and need him to navigate.

Grand elderly actor who has been quietly observing St. George's shelter; reveals himself by rising to perform Shakespeare's Tempest at the height of a terrifying raid, transforming panic into awe.

Chatty spinster who boards at Mrs. Rickett's, follows royal family news avidly, accompanies Polly to the shelter, and prevents her escape by citing danger of staying behind.

White-haired knitting woman from Mrs. Rickett's boarding house; chooses St. George's for company rather than loneliness, and also helps prevent Polly from leaving.

Ill-tempered stout man who boards at Mrs. Rickett's; makes blunt, often grim comments about raids and casualties.

Mother who shelters with daughters Bess, Irene, and Trot; reads fairy tales to keep children calm; husband is in the Army.

Church rector who runs St. George's shelter, bolts the door once everyone is in, attempts to start group singing during the worst bombing, and reads Agatha Christie behind an ecclesiastical cover.

Incorrigible elder Hodbin sibling who stages bombing sorties through the house, torments Binnie, and nearly falls out a window identifying planes.

Pursed-lipped supervisor at Townsend Brothers who reprimands Polly for her disheveled appearance but allows one day's grace given the Blitz.

A woman who works with Polly at Townsend Brothers; she assists Polly after her breakdown, takes her home to her Bloomsbury boardinghouse, and offers food and shelter, unaware of Polly's true situation.

Conscientious warden who catches Polly near the bombed incident site, warns her about danger, and watches to see she goes directly to shelter, delaying her access to the drop.

Bedridden patient in the same ward as Mike; reads newspapers aloud to him and provides grounded commentary on events.

A nurse in the war hospital who feeds Mike broth and tends his fever while deflecting his requests for newspapers.

A night-duty nun at the hospital who calms Mike during fever episodes and reveals that he is in Orpington, not Dover.

A shell-shocked soldier who repeatedly panics during sirens, believing the Germans are invading, and must be calmed by nurses.

Small child shelter regular, cheerfully blunt about fears of death

Soldier Mike saved at Dunkirk who visits to deliver the count of lives saved, unwittingly deepening Mike's anxiety about timeline damage

Colleague at Townsend Brothers who delivers the news of Marjorie's death and teases Polly about waiting for a mysterious man

Oxford historian recalled by Eileen as 'insufferable'; had done a recon drop to Oxford in July 1940, likely on an exciting wartime assignment

Difficult customer at Padgett's who keeps Eileen past closing time trying to find a camel's hair blazer for her son Roland

A new Oxford historian who arrives via drop into a London Underground staircase on September 17, 1940, one day off his intended arrival date; identity not yet revealed.