BritBox: best new shows streaming this week

Discover the best new shows to stream from 15 September to 21 September 2025 on BritBox with this guide.
grace season 5 tv show

BritBox: new this week

Mrs. Brown’s Boys Seasons 1-4 (17 September)

Mrs. Brown's Boys. Image: Bbc. Streaming On Britbox.
Mrs. Brown’s Boys. Image: BBC. Streaming on BritBox.

Series. A comedy centered on a loud-mouthed Irish matriarch whose favorite pastime is meddling in the lives of her six children.

Starring Brendan O’Carroll, Jennifer Gibney, Paddy Houlihan, Eilish O’Caroll.

Grace Season 5 (18 September)

Series. This series delves into four new investigations that push Grace and his team into some of their most high stakes cases yet. From a chilling stadium threat that drags Grace into the dangerous underworld of organised crime, to a mysterious hotel death linked to a trail of digital deception, he must navigate the criminal landscape where nothing is as it seems while also still reeling from the emotional fallout of Sandy’s death. Watch the trailer.

Starring John Simm, Richie Campbell, Zoë Tapper, Brad Morrison, and Laura Elphinstone.

BritBox: recently added

Downton Abbey Seasons 1-6 (12 September)

Series. This iconic period drama follows the lives of the Crawley family and the servants who worked for them at the turn of the 20th century in an Edwardian English country house. Lord Robert Crawley, Earl of Grantham sees his family heritage, especially the grand country home Downton Abbey, as his mission in life. The death of his heir aboard R.M.S. Titanic means distant cousin Matthew Crawley is suddenly next in line and is moving onto the vast estate with his even more modernist, socially engaged mother.

Starring Hugh Bonneville, Michelle Dockery, Dan Stevens, Maggie Smith, Laura Carmichael, and Jim Carter.

Dinosaur Apocalypse (10 September)

Dinosaur Apocalypse. Image: Bbc.
Dinosaur Apocalypse. Image: BBC.

Documentary. Explore an incredible discovery in a prehistoric graveyard of fossilised creatures that are astonishingly well preserved and could help change our understanding of the last days of the dinosaurs. Evidence from the site provides insights into the day when an asteroid bigger than Mount Everest devastated the planet and caused the extinction of the dinosaurs. Based on brand new evidence, witness the catastrophic events of that day play out minute by minute.

Starring David Attenborough, Phillip Manning, and Robert DePalma.

Death Valley Season 1 (2 September)

Death Valley. Image: Bbc. Streaming On Britbox.
Death Valley. Image: BBC. Streaming on BritBox.

Series. Retired actor John Chapel reluctantly teams up with eager young detective Janie Mallowan to form the perfect crime-fighting duo – if they can only get along. Thrown together by the murder of John’s neighbour, the hilarious duo solve gripping weekly murders across scenic Wales, while constantly clashing over their wildly different instincts. As they navigate crime scenes and personal baggage, their unlikely friendship begins to grow. Watch the trailer.

Starring Timothy Spall, Gwyneth Keyworth, Steffan Rhodi, and Alexandria Riley.

Richard Osman’s House of Games Season 3 (1 September)

Quiz Show. Richard Osman hosts this game show, in which he sets a panel of four celebrity contestants a series of games and puzzles to test their general knowledge.

Professor T Season 4 (28 August)

Series. Ben Miller returns as Professor Jasper Tempest, a genius Cambridge University criminologist with OCD and an overbearing mother, to assist the police in solving crime.

Starring Ben Miller, Frances De La Tour, and Juliet Aubrey.

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Leah J. Williams is an award-winning entertainment and technology journalist who spends her time falling in love with media of all qualities. One of her favourite films is The Mummy (2017), and one of her favourite games is The Urbz for Nintendo DS. Take this information as you will.