"Slow Horses" season 4 has already come and gone. Yes, this means you can dive straight back into the action by streaming all six episodes right now.
The show has been a critical hit for Apple TV Plus and famously, each season ends with a trailer for the following season. Season 3 was no different. The third season of this British spy thriller was incredible — it was the best TV show we watched in 2023 — and, as is tradition, we got a trailer for season 4 at the end of the sixth and final episode of the season. And we got a trailer for "Slow Horses" season 5 after the final episode of season 4 since Apple already greenlit a fifth season.
