Sergeant Malgor describes his team's fitness routine, which involves running once a week; the team responds to an emergency call-out involving a domestic dispute after someone has heard shots fired.
Tornadoes are among the most powerful forces on earth; with swirling winds of more than 300 miles per hour, and the strength to destroy nearly everything in their path, they account for an average of 60 deaths every year.
Sniffer-dog Badger picks out a suspect suitcase at Gatwick and his handler finds nearly three kilos of cocaine hidden inside and at Bristol Airport a man is caught smuggling cigarettes.
Sniffer-dog Barney makes his second cocaine discovery in three days when a woman from Trinidad is arrested; in Manchester, a passenger from Bangladesh is arrested after becoming a suspect involved in a terrorist coupe.
The Polar Vortex is a low-pressure area and wide expanse of swirling cold air that is normally parked in the polar regions; in 2019, the vortex created conditions on Earth that were colder than Mars.
Catching another collection of on-camera calamities, featuring rally cars speeding along Italian roads, and a terrifying dust devil that's out of control.
Humberside Search and Rescue rush to Thornwick Bay to help a man who has suspected head and spinal injuries; in the Lake District, Maria's walking holiday is cut short.
A mountain expedition doesn't go as planned; a powerboat race with a horrific outcome; a downhill cycling speed racing event, which races towards catastrophe.
Officers in Manchester deal with a drunk man who's lost his passport, and a man on a student visa who claims to be studying, but has been training for a UK lorry driving license on the side.
A fell runner breaks her leg in the Ochil Hills and must remain calm while rescue teams figure out the best way to extract her; in Portscatho, a dog gets stuck on a cliff; the Keswick Mountain Rescue team help some injured walkers.
This is the fourth episode of Border Invasion, where embedded crews follow elite law enforcement units as they take down smugglers on the US-Mexico border.