The Last Kingdom: Seven Kings Must Die is a 2023 British historical drama film directed by Edward Bazalgette, written by Martha Hillier, and based on The Saxon Stories by Bernard Cornwell.

[1] Series regulars Alexander Dreymon, Harry Gilby, Mark Rowley, Arnas Fedaravicius, Cavan Clerkin, James Northcote, Ross Anderson, Ilona Chevakova, Rod Hallett, Ewan Horrocks and Steffan Rhodri reprise their respective roles.

Although retired from war, Uhtred is informed that Edward's eldest son Aethelstan will likely attack his younger brother Aelfweard and makes plans to stop him.

Uhtred arrives and witnesses the destruction of pagan monuments, then learns that King Hywel Dda has submitted to Aethelstan after his son was taken hostage.

Although they initially decline the offer of allying with a pagan, Aethelstan embarks upon an invasion of Scotland, forcing King Constantin and the other rulers to form an alliance.

At the Battle of Brunanburh, Uhtred and Aethelstan's forces are heavily outnumbered and make a tactical withdrawal, allowing Saxon cavalry to flank from behind.

[3] In October 2021, prior to the fifth season of The Last Kingdom being released on Netflix in early 2022, the feature-length sequel to the series was announced at the MCM London Comic Con by Dreymon, who acted as executive producer as well as starring as Uhtred on the show.

It was given the working title Seven Kings Must Die and would follow events of the series which took place over a circa-45-year period of history from 866 onwards focusing on the Kingdom of Wessex and ongoing Viking incursions into England.

[4] The screenplay for Seven Kings Must Die was written by Martha Hillier with direction by Ed Bazalgette and production by Marchant, Gareth Neame and Mat Chaplin.

[1][6] Several characters portrayed by series regulars on The Last Kingdom were cut from the film during production which included Lady Aelswith (Eliza Butterworth), King Edward (Timothy Innes), Lady Aelfwynn (Phia Saban), Cynlaef (Ryan Quarmby) and Uhtred's elder children Stiorra (Ruby Hartley) and Young Uhtred (Finn Elliot) due to the condensed running time from the change in format.

[5] Globally, The Last Kingdom: Seven Kings Must Die debuted at number one on Netflix's Top 10 Film English titles for the tracking week of 10–16 April 2023 with 35.5 million hours viewed.

[14] Leslie Felperin in The Guardian said that the film has "a ton of plot crammed tightly into the running time", but that the director "Edward Bazalgette manages the storytelling efficiently".