Set in the near future, Code 404 revolves around a pair of top-notch investigators, DI John Major (Daniel Mays) and DI Roy Carver (Stephen Graham). When Major is killed on duty, his body is transferred to an experimental artificial intelligence project to revive him. However, the AI lacks the crimefighting instincts of Major.
As of 2022, all 3 series have aired.[2] The third series premiered on 4 August 2022.[3] This was confirmed to be the final series of Code 404, with Sky citing that the reasons for its cancellation were rooted in the main cast being too busy to film a fourth series.[4]
Detective John Major is killed after a failed sting operation, but the Met brings him back from the dead as part of an experimental artificial intelligence project, let by American scientist Alison Parfit. Major immediately goes on the hunt for his killer, dragging his still shocked partner and best friend Roy Carver along for the ride. Liam Cleasby, an apparently minor criminal at the sting, appears to be deeply connected to Major's murder.
2
Episode 2
Al Campbell
Daniel Peak
29 April 2020 (2020-04-29)
Parfit reveals that if the A.I. Ethics Committee deem the project a failure, Major will be 'switched off' and he'll die for good. She gives Major a software update, but it’s setting of American phraseology is irritating to all. Kelly Major does not take her revived husband back, but does not reveal that she and Carver have been living together since Major died. DIs Gilbert and Lyle, working half-heartedly on the case of Major's murder, are revealed to be feeding information to Cleasby.
3
Episode 3
Al Campbell
Daniel Peak
29 April 2020 (2020-04-29)
Former police commissioner Helen Chalmers heads the AI Ethics Committee reviewing Major's progress. Sweet on Major – they once slept together – she secretly feeds him information on his murder case. DS Dennett has given Major and Carver a new assignment, but Major would rather stake out Kelly's work. Kelly reveals she started seeing someone else after Major died, but does not tell him that it is Carver. Kristoff, the apparent lead criminal at the deadly sting, reveals to Major and Carver that he was no more than a patsy, and is worried that Cleasby is out to kill him; he is later found murdered.
4
Episode 4
Al Campbell
Daniel Peak
29 April 2020 (2020-04-29)
The pressure is on with Major and Carver's latest assignment; protecting Chalmers, the head of the A.I. Ethics Committee. Success could secure Major's future, whereas failing to do so could seal his fate. Meanwhile, feeling stung by Kelly's rejection, Carver contemplates a transfer to Scotland. But when Kelly asks him to stay, he's filled with renewed hope.
5
Episode 5
Al Campbell
Daniel Peak
29 April 2020 (2020-04-29)
To Carver's bewilderment, Major reveals that he is going to move back in with Kelly. Parfit discovers disturbing information in the AI Ethics files.
6
Episode 6
Al Campbell
Daniel Peak
29 April 2020 (2020-04-29)
With Major's AI finally living up to the hype, Carver and Kelly come clean about their relationship. The team lies in wait to catch The Juggler.
Series 2 (2021)
No. overall
No. in season
Title
Directed by
Written by
Original air date
7
1
"Episode 1"
Al Campbell
Daniel Peak
1 September 2021 (2021-09-01)
It has been three weeks since Carver and Major took down the Juggler, but personal problems still hinder the pair's professional success.
8
2
"Episode 2"
Al Campbell
Daniel Peak
1 September 2021 (2021-09-01)
The re-emergence of a case from his past worries Major and it seems a simple firmware update will not help, while news from Kelly heightens his stress even more.
9
3
"Episode 3"
Al Campbell
Daniel Peak
1 September 2021 (2021-09-01)
Major and Carver are assigned an investigation into reports of a dangerous new drug used in an underground MMA fight ring.
10
4
"Episode 4"
Al Campbell
Daniel Peak
1 September 2021 (2021-09-01)
Major has a rival. Introducing BRIAN (Brain Representation In Artificial Networks): he's cute, fun, gives great pilates classes, sounds an awful lot like Richard Ayoade and is programmed to maximise arrests in the Greater London area.
11
5
"Episode 5"
Al Campbell
Daniel Peak
1 September 2021 (2021-09-01)
Major's mood swings are getting out of hand. He and Carver are given the task of supplying Cleasby with a new identity under witness protection.
12
6
"Episode 6"
Al Campbell
Daniel Peak
1 September 2021 (2021-09-01)
On the verge of full-blown systems failure, Major makes a desperate, last ditch effort to clear his dad's name. Carver believes he's got Clifford trapped, but the old cop isn't going down that easily.
When a member of the SIU is brutally murdered, Carver and Major are assigned to investigate the case, and suspect they may be dealing with a serial killer.
14
2
"Episode 2"
Al Campbell
Daniel Peak
4 August 2022 (2022-08-04)
Carver tries to use Cleasby as bait to lure out the Puppet Master.
15
3
"Episode 3"
Al Campbell
Daniel Peak
4 August 2022 (2022-08-04)
Major discovers that he has been hacked.
16
4
"Episode 4"
Al Campbell
Daniel Peak
4 August 2022 (2022-08-04)
Chalmers' trial collapses after Major's testimony is found to be fatally flawed.
17
5
"Episode 5"
Al Campbell
Daniel Peak
4 August 2022 (2022-08-04)
The evidence against Major begins to tally up, but Carver isn't convinced that his closest colleague is a multiple murderer.
18
6
"Episode 6"
Al Campbell
Daniel Peak
4 August 2022 (2022-08-04)
Kelly becomes the final target of the Puppet Master.
