September TV Series Premieres: Outlander’s Prequel Returns, New Slow Horses Season, and the Comedy Everyone’s Talking About

Emma Caldwell
August 31, 2026

With the batteries charged to face the return to routine, and planners ready not to miss the editorial news and film premieres that autumn brings us, the moment arrives to take a look at the September series premieres calendar. A month in which we can enjoy the return of the Outlander prequel, the new season of Slow Horses, and the comedy that everyone will be talking about.

Pedro Alonso’s Mexican foray, known for portraying Berlin in La casa de papel, the new season that many consider the heir to Friends, and a couple of British miniseries are other audiovisual proposals arriving on streaming platforms in the coming weeks.

To make sure you don’t miss anything, here are the ten September series premieres that people will be talking about the most in the near future.


David Morrissey in a still from the British miniseries Gone.

Gone. Filmin. September 1.

David Morrissey stars in this British miniseries from George Kay, the creator of Lupin and The Long Shadow. He plays Michael Polly, a stern headteacher who returns home one afternoon to find that his wife, Sarah, has disappeared. As hours pass, he reports the disappearance to inspector Annie Cassidy, a pragmatic and inflexible detective unsettled by the director’s apparent stoicism.

As the case becomes complicated with the appearance of troubling evidence, Annie is assigned the role of liaison with the family. But word of the disappearance spreads despite Michael’s attempts to contain it, while his commitment to his professional duties remains unwavering.


Aimee-Ffion Edwards in an image from the British miniseries, Creednos.

Creednos. Movistar Plus+. September 3.

Inspired by one of the UK’s biggest judicial scandals, this British four-episode miniseries reconstructs the collective fight of a group of survivors who managed to change how sexual assaults are investigated. It all begins with the testimony of several women, victims of the same sexual offender.

Together they discover that the biggest obstacle to achieving justice is not finding the culprit, but getting someone to believe them. While the predator continues to act for years with total impunity, they must confront prejudice, police errors, and an incapable system to protect them. Written by Jeff Pope (What I Learned from My Penguin, Philomena), Aimee-Ffion Edwards (Slow Horses, Peaky Blinders) plays Sarah, one of the first women who report the assaults and whose determination makes her a symbol of the collective struggle.


Kit Harington in an image from the miniseries adapting Charles Dickens’ A Tale of Two Cities.

A Tale of Two Cities. MGM+. September 6.

Prime Video’s premium channel is responsible for premiering in our country the adaptation of one of Charles Dickens’ best-known novels, with Kit Harington (Game of Thrones) as the lead. Set in 1782, this four-episode production places us in a moment in which tension runs high between the war of France and England. The young Lucie Manette will see her life take a drastic turn when she receives a message from Paris: her father, whom they believed dead for two decades, might be alive.

The messenger is the idealistic Frenchman Charles Darnay, who is arrested and charged with treason. Lucie then seeks the help of a brilliant but unstable lawyer, Sydney Carton (Harington), to free the young man and help him reach Paris. A powerful and complex love triangle in which both men will fight to be worthy of her love, and she must make a decision.


Matthew MacFadyen in an image from the miniseries The Lady’s Miniature.

Historia de dos ciudades. MGM+. September 6.

The premium channel of Prime Video is responsible for premiering in our country the adaptation of one of Charles Dickens’ best-loved novels, with Kit Harington (Game of Thrones) as the lead. Set in 1782, this four-episode production takes us to a moment when tension is at its peak between the war of France and England. The young Lucie Manette will see her life take a turn when she receives a message from Paris: her father, long believed dead for two decades, might be alive.

The messenger is the idealistic Frenchman Charles Darnay, who is arrested and accused of treason. Lucie then seeks the help of a brilliant but unstable lawyer, Sydney Carton (Harington), to free the young man and help him reach Paris. A powerful and complex love triangle in which both men will strive to be worthy of her love, and she must make a choice.


Matthew MacFadyen in an image from the miniseries The Lady’s Miniature.

The Lady’s Miniature. Movistar Plus+. September 9.

Elizabeth Banks (Mrs. America) and Matthew Macfadyen (Succession) star in this dramedy about the (im)balances of power in a couple after a technological accident triggers the final crisis in their relationship. Because Lindy and Les Littlejohn were a brilliant couple, but the years have turned mutual admiration into a quiet war of reproaches. When a technological accident reduces Lindy to a few inches in height, the sentimental crisis takes on another dimension (literally).

Forced to live under extraordinary circumstances, both will have to confront the power dynamics, frustrations, and wounds that have defined their relationship, in which Lindy’s miniaturization becomes a powerful metaphor about emotional wear within the couple, inequality, and the need to reclaim one’s own identity. Based on Manuel Gonzales’ short story, the production, which premieres in full, consists of ten episodes.


Pedro Alonso in an image from The Trial.

The Trial. Prime Video. September 11.

After the son of a powerful businessman is accused of sexually assaulting a schoolmate, the parents of both parties declare war: one seeking justice for the crime and the other using every resource to intimidate the victim. Willing to protect their children to the last consequences, both parents will discover how thin the line between good and evil really is.

This Mexican-produced platform original, inspired by real events and consisting of eight episodes, stars Eugenio Derbez (Radical) and the Spanish actor Pedro Alonso, known for his roles in La casa de papel and Berlín.


Olivia Cooke in an image from the sixth season of Slow Horses.

Slow Horses. Apple TV+. September 16.

The sixth installment of the best spy series around, following the footsteps of Britain’s worst detectives, returns with six new episodes in which the Slow Horses are in danger. Someone has set out to take down Jackson Lamb’s team, and the head of the spies themselves must flee and hide to stay safe.

As they watch former members of The Swamp be eliminated one by one, Diana Taverner entangles them in a highly dangerous game of revenge. Six episodes of action and tension bringing back a familiar face, Sid Baker, played by Olivia Cooke (The Dragon House), who (as we thought until now) was killed in the first season of the series.


Ella Beatty as Lizzie Borden in Ryan Murphy’s Monster anthology series, Monster.

Monsters: The Lizzie Borden Story. Netflix. September 17.

Following the uneven success of seasons focused on Jeffrey Dahmer, the Menéndez brothers, and Ed Gein, the real-crime anthology created by Ryan Murphy now centers on a female lead in its new installment, Lizzie Borden. Or, to put it plainly, the woman who in the mid-19th century was the only one suspected of killing her father and stepmother, though she was ultimately acquitted.

Apparently, Murphy has more in store, and although this fourth entry bears Borden’s name, throughout its eight episodes it will also tell the story of Aileen Wuornos, an American woman who, between 1989 and 1990, killed seven men in Florida. To portray her, he has chosen one of his favorite actresses, Sarah Paulson.


Hermione Corfield and Jeremy Irvine are Julia and Henry in Outlander: Blood of My Blood.

Outlander: Blood of My Blood. Movistar Plus+. September 19.

After the dramatic events at the end of the first season, the second season of the Outlander prequel continues the story of Jamie Fraser and Claire Beauchamp’s parents. On one hand, Brian Fraser and Ellen MacKenzie must face the consequences of their flight in a Scotland divided by the impending Jacobite rebellion.

Julia Moriston and Henry Beauchamp, for their part, will keep fighting to stay together after the journey through the stones forever alters their lives. Two love stories separated by centuries, yet joined by fate, returning to intertwine in this production that blends adventure, time travel, and epic romance.


Matthew McConaughey and Woody Harrelson in an image from Brothers.

Brothers. Apple TV+. September 23.

The month’s chatter (and comedy) is going to be this production, where the fine line between reality and fiction blurs to make one of the most beloved fictional couples the protagonist once again. This time, Woody Harrelson and Matthew McConaughey play fictionalized versions of themselves. Their long friendship will be tested when they uncover a secret hidden for decades—perhaps they are brothers.

When Woody’s daughter’s wedding is canceled, he heads to Austin for a stay at Matthew’s ranch. What began as a healing getaway soon sours when Matthew’s mother accidentally confesses the secret: that the two friends could actually be brothers. While Woody stirs the ranch to uncover the truth, his friend undergoes a very different identity crisis and, along the way, the possibility of running for Governor of Texas arises.


Amita Rao and Lucy Freyer in an image from the American series, Adults.

Adults. Disney+. September 30.

Samir, Billie, Paul, Issa, and Anton will have to keep facing the challenges of adult life in the eight episodes that make up the second season of this ensemble comedy about a group of twenty-somethings in New York trying to navigate love, work, friendships, and family together. Humor to depict the successes, disappointments, and the most awkward moments of an entire generation Z.

Together, these five friends will do everything they can to avoid hurting the feelings of those around them, devising strategies and seeking solutions to problems they dare not confront. But whatever happens, they will always be there for each other.

Emma Caldwell
Emma Caldwell
I’m Clara Desrosiers, a writer and fashion editor based in Toronto. I founded Backdoor Toronto to explore the intersection of fashion, identity, and culture through honest storytelling. My work is driven by curiosity, community, and a love for the creative pulse that defines this city.