Set in the near future, Code 404 revolves around two Detective Inspectors, DI John Major and DI Roy Carver, who are the top crime fighting duo in the Unit. But when an undercover sting goes horribly wrong, Major is gunned down on the job and killed.How will the SIU function without Major? It doesn't have to. As an ‘asset' considered too valuable to lose, Major's body is fast-tracked into an experimental Artifical Intelligence project to bring him back from the dead. The only problem is, Major 2.0 may look like and sound like the original, but something has been lost in translation - quite a lot actually. His arrogant demeanour and gung-ho approach remain but his crimefighting instincts have completely deserted him. Somehow, Major's error-strewn hunches and Carver's scrambling to make good allows them to just about scrape by. But while the experiment might be hailed as a success, on the front line Roy Carver is left dealing with an increasingly deluded partner.
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. Major immediately goes on the hunt for his killer, dragging his still shocked partner and best friend Roy Carver along for the ride
Major screws up during an investigation and Carver wonders whether to turn him in. But when he learns of the consequences, he decides to cover for him.
After he and Carver are given a new assignment by Dennett, a suspicious Major prefers to stake out Kelly's work as he has a hunch she's been seeing someone else.
The pressure is on in the latest assignment - covering for the head of the AI Ethics Committee. Failure could mean it's shutdown for Major once and for all...
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.
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.
Major, Carver and Kelly have gone their separate ways. Things are looking up for the AI-enhanced Major, whilst Carver is gunning for a promotion and is knee deep in a new case.
Carver and Major receive new information on the Chelsea Bridge Case – a £50 million robbery committed twenty years ago by a gang who seemed to vanish into thin air.
Taken off the Chelsea Bridge case, Major and Carver are assigned an investigation into reports of a dangerous new drug used in an underground MMA fight ring.
Under investigation and stuck on limited duties, tensions are high between Carver and AI partner Major, but when a fellow copper is killed, it's back to action.
With a serial killer at large, Major and Carver call on the help of forensic psychologist Professor McAllister. Parfit worries about Major's AI updates.
The body count rises, and Carver and McAllister have no choice but to follow the clues and play the killer's twisted game. Meanwhile, Major becomes increasingly disillusioned as he deals with Carver's rejection and an outside threat to his A.I.
Complete episode guide for Code 404 with detailed information about every season and episode including air dates, summaries, ratings, and streaming availability in United States.
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After narrowly foiling a bomb plot, Carver and Major suspect it was just one member of a much larger organisation. Clifford Major continues to throw wrenches into the Chelsea Bridge case.
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.
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.
After being kicked out of the lab by Parfit following the revelation that his A.I. has been compromised, Major is falling apart under the pressure. At the same time, there's a breakthrough in the serial killer case when a witness provides a shocking revelation.
Finally, Chalmers, the former Police Commissioner who has plagued Major since the day he was reanimated, faces trial. While Major's busy testifying, Carver's running out of time to decipher the latest clue and save the killer's next target.
Time is running out as suspicions run wild within SIU. Now Carver must clear Major's name and put a stop to the killer before they enact their final revenge. But who can Carver trust? And who will outwit who in the final chapter of this deadly game?