Aug 21, 2023 · 43m
A Surrey police officer receives life-changing injuries when his patrol car is involved in a terrifying high-speed crash. Two officers in Cheshunt risk their lives and run into a burning building.


With attacks on emergency service workers on the rise, this series uses bodycam and CCTV footage to tell the stories of brave 999ers assaulted in the line of duty.
Browse every episode and jump into details.
Aug 21, 2023 · 43m
A Surrey police officer receives life-changing injuries when his patrol car is involved in a terrifying high-speed crash. Two officers in Cheshunt risk their lives and run into a burning building.
Aug 22, 2023 · 43m
In London, a Met officer is attacked by a man wielding a four-foot-long broadsword. An officer in York must use all her strength and courage to rescue a colleague who has fallen into an icy river.
Aug 23, 2023 · 43m
Two officers in south Wales are confronted by a man with a kitchen knife. In Leeds, a traffic cop puts his life at risk to save a driver trapped in his van. Surrey Fire and Rescue service are faced with a huge wildfire.
Aug 24, 2023 · 43m
A Birmingham police officer is stabbed in the neck by someone he is arresting. In Hull, an officer and his faithful police dog come under a violent attack. After a life-threatening injury, a West Midlands paramedic has found a new lease of life, thanks to an unusual hobby.
Aug 25, 2023 · 43m
Two officers in Leeds are faced with a knifeman on a city-centre bus. Sussex police take on the dangerous drivers putting us all at risk on the roads, and we catch up with an officer seriously injured in an attack.
Aug 28, 2023 · 43m
Two RAF aircraft are dispatched to save the life of a sailor in heavy seas 800 miles out in the Atlantic. Essex police film dangerous drivers from an HGV, with life-changing results for some of them. A paramedic in Barry in Wales finds herself the victim of a terrifying assault.
Aug 29, 2023 · 43m
999ers on the scene look back at the 7/7 attacks in London. Police are called as a volatile patient assaults two paramedics on the Isle of Wight. In Manchester, a young police dog and his handler face a man armed with a crowbar.
Aug 30, 2023 · 43m
A Merseyside police officer is run over as he searches a van thought to be connected to drug runners. A call handler in Hampshire saves the life of a baby who isn’t breathing. After a life-changing injury, a former PC is finding his feet again.
Aug 31, 2023 · 43m
In London, emergency responders remember the nightmare they faced during the Westminster Bridge terror attack. In Staffordshire, a newly taser-trained PC must decide whether to fire her weapon for the first time, at a machete-wielding woman.
Sep 1, 2023 · 43m
In Staffordshire, two officers save the life of a man in a burning building. In Avon and Somerset, police tackle county lines drug dealing, and in Norfolk, two firearms officers come face to face with a gunman in a car park.
Sep 4, 2023 · 43m
In Wakefield, a police officer is the victim of a violent attack. Greater Manchester Police are tackling the issue of knife crime in the city. The RAF are called in to help transatlantic rowers in distress.
Sep 5, 2023 · 43m
Two paramedics talk of their experience on the scene of the 2017 London Bridge attacks. In Manchester, the police launch a new initiative to crack down on knife crime. After losing his eye, a former police officer has returned to the force in a new role.
Sep 6, 2023 · 43m
A Fire crew in Burnley comes under attack on their busiest night of the year. In Swindon, two paramedics are violently assaulted by a patient, and police in Derbyshire tackle the problem of county lines drug gangs.
Sep 7, 2023 · 43m
In London, a paramedic is sexually assaulted on a call. Firefighters in Nottinghamshire tackle one of the biggest blazes they’ve ever seen, and the Police Federation recognise the actions of officers across England and Wales.
Sep 8, 2023 · 43m
It’s a busy night in Newcastle for Northumbria Police as they work the night-time economy shift. We take a look at one of the most dangerous specialties in the police – firearms. The National Police Air Service face danger in the air.
Quick answers about this season's release timeline and episode lineup.
Critical Incident Season 4 premiered on August 21, 2023.
Critical Incident Season 4 has 15 episodes.
The season opens with Season 4 Episode 1, "High-Speed Crash". It aired on August 21, 2023.
Go to Season 4 Episode 1