Apple TV+ has unveiled the trailer for season four of its globally celebrated, Emmy Award-nominated and BAFTA Award-winning series, ‘Slow Horses,’ starring Academy Award winner Gary Oldman.

The series is a darkly humorous espionage drama that follows a dysfunctional team of British intelligence agents who serve in a dumping ground department of MI5 known un-affectionately as Slough House. Season four opens with a bombing that detonates personal secrets, rocking the already unstable foundations of Slough House.

Oldman stars as Jackson Lamb, the brilliant but misanthropic leader of the spies, who end up in Slough House due to their career-ending mistakes as they frequently find themselves blundering around the smoke and mirrors of the espionage world. The returning ensemble cast also includes Academy Award-nominee Kristin Scott Thomas, BAFTA Scotland Award-winner Jack Lowden, Saskia Reeves, Rosalind Eleazar, Christopher Chung, Aimee-Ffion Edwards, Kadiff Kirwan and Academy Award-nominee Jonathan Pryce. SAG Winner Hugo Weaving, BAFTA winner Joanna Scanlan, IFTA winner Ruth Bradley, Tom Brooke and James Callis join “Slow Horses” in season four.

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The six-episode fourth season will premiere globally on Wednesday, September 4 with the first episode, followed by one new episode weekly, every Wednesday through October 9, on Apple TV+.