Returning from vacation can be traumatic, but fortunately TV series help make the transition back to the routine more enjoyable. September arrives with a calendar full of must-watch events, including new stories, big returns, and spin-offs ready to win over audiences. From crime to espionage, passing through thrillers, family dramas, and stories set among the school desks, there’s truly something for every taste. We have selected 10 TV series to watch in September 2026, ordered by release date.
The 10 Best TV Series Not to Miss in September 2026
- The Gentlemen – Season 2
- CIA – Season 1
- Nightsleeper – Out of Control – Season 1
- Slow Horses – Season 6
- Neagley – Season 1
- Monster – The Lizzie Borden Story
- MobLand – Season 2
- Minerva – The School
- Brothers
- The Other Bennet Sister – Season 1
The Gentlemen – Season 2
Where to watch: Netflix
Release date: September 3
Eddie and Susie are ready to return with a new season of The Gentlemen, featuring crime, shady dealings, and quintessentially British humor. The criminal empire has grown, and with it so have the dangers and enemies. The second season also promises new characters (such as the Italians played by Sergio Castellitto, Benedetta Porcaroli, and Michele Morrone) and the unmistakable style of Guy Ritchie.
CIA – Season 1
Where to watch: Italia 1
Release date: September 4
Spin-off of the successful series FBI, CIA follows the collaboration between CIA agent Colin Glass (Tom Ellis) and FBI agent Bill Goodman (Nick Gehlfuss). The two form a decidedly unlikely pair: Glass is irreverent, brash, and not inclined to follow the rules, while Goodman is methodical and respectful of the law. When assigned to the CIA station in New York, they must learn to work together.
Nightsleeper – Out of Control – Season 1
Where to watch: Sky and NOW
Release date: September 4
An ordinary train journey turns into a nightmare when things go horribly wrong. Nightsleeper – Out of Control is a taut thriller set entirely aboard a night train from Glasgow to London. Joe Roag (Joe Cole), a police officer onboard the carriage, and Abby Aysgarth (Alexandra Roach), interim technical director of the National Cyber Security Centre, must team up to save the passengers and avert a catastrophe.
Slow Horses – Season 6
Where to watch: Apple TV
Release date: September 16
Jackson Lamb and his unlikely team of spies are ready to hit the ground running again. In the sixth season of Slow Horses, the Slough House crew finds themselves in the crosshairs, with danger bigger than ever. Jackson Lamb (Gary Oldman) discovers that anyone who has ever worked at Slough House has become a target, forcing the team to hide and fight for their survival. As Diana Taverner (Kristin Scott Thomas) pulls them into a hazardous cycle of reprisals and vendettas, the Slow Horses must rely on their wits to get out of trouble once more.
Neagley
Where to watch: Prime Video
Release date: September 16
Frances Neagley, the beloved character from the Reacher universe, takes the lead in the new spin-off Neagley. The former ally of Jack Reacher, portrayed by Maria Sten, finds herself drawn into a personal investigation after the mysterious death of someone close to her.
Monster – The Lizzie Borden Story
Where to watch: Netflix
Release date: September 17
The Netflix anthology series returns with a new crime narrative inspired by a famous real-life case. This time the focus centers on the life of Lizzie Borden, a young socialite from New England accused of ax-murdering her father, Andrew, and stepmother Abby in their Fall River home in Massachusetts. Played by
MobLand – Season 2
Where to watch: Paramount+
Release date: September 18
The second season picks up the Harrigan family saga after the events of the first chapter, with Conrad (Pierce Brosnan) and Maeve (Helen Mirren) still at the center of the fight for control of the North London crime empire. But this time the threat also comes from within: the family’s divisions threaten to erupt into a full-blown war. Harry (Tom Hardy) must navigate rivalries, betrayals, and violence as he moves among enemies and allies alike.
Minerva – The School
Where to watch: Netflix
Release date: September 22
Set at a military high school in Naples, Minerva – The School follows a group of students confronting rigid rules, factions, military discipline, and fencing lessons. Amid friendships, rivalries, and forbidden loves, Salvo Fusco (Ciro Minopoli) arrives at the academy with a clear objective: uncover the truth behind his best friend’s disappearance. The cast also features Massimiliano Gallo, Cristiana Capotondi, and Irene Maiorino, alongside the young Biagio Venditti and Margherita Buoncristiani.
Brothers
Where to watch: Apple TV
Release date: September 23
Matthew McConaughey and Woody Harrelson portray romanced versions of themselves in this comedy that starts from a surprising revelation: the two longtime friends might actually be brothers. When Woody temporarily moves to Matthew’s ranch with his family, a decades-old secret comes to light, turning their lives upside down.
The Other Bennet Sister – Season 1
Where to watch: Sky and NOW
Release date: September 26
We return to Jane Austen’s world, but from an unexplored perspective. The central figure of The Other Bennet Sister is Mary Bennet, the least prominent sister of the famous Pride and Prejudice family, here portrayed by Ella Bruccoleri. The series traces her journey toward discovering her own identity, amid love, social expectations, and the yearning for independence.
So mark the dates on your calendar, pick your preferred platform, and let yourself be drawn into a new story. After all, even the return can be a bit more enjoyable when there’s a great series waiting on the sofa.
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