In Episode 1, the Fierce Earth team encounter the most feared event in weather - the hurricane. Florida based Stormchaser Mike takes us on a wild ride into the eye of the storm; we meet three childhood friends, who had their lives turned upside down when Hurricane Ike struck their homes in Texas; Leo is challenged to take hurricane force winds head on and Zoe learns how we're designing buildings to cope with their awesome force.

In Episode 2 the Fierce Earth team investigates wildfires and discover how they rage all over the world, leaving a trail of devastation and destruction. The team travels to Colorado and meets one of the youngest female fire fighters in the US, who has been on the front line and tackled wildfires head on after her house and part of her neighborhood was burnt down. Zoe experiences first-hand what it feels like to try and outrun a wildfire and Leo's challenged to see how long he can survive in raging heat of up to 800 degrees in a special fire chamber experiment.

In Episode 3 Clare and Leo head to Death Valley in California which is officially the hottest place in the entire world, with record-breaking temperatures of a sizzling 57 degrees centigrade. The pair endure a special test to work out what color clothing is the best to wear in heat; Clare finds out what it's like to go to school in the world's hottest place; Leo becomes one of the first people in the world to climb the hidden canyons. Later, in the intense heat, Leo completes a section of the Badwater Ultramarathon, a race five times longer than the London marathon.

In Episode 4 The Fierce Earth team investigate the terrifying giant waves of the tsunami. Zoe and Dougal travel to Japan to meet child survivors of the 2011 disaster and test ride the brand new tsunami escape pod. Meanwhile, Leo attempts a very unusual route to safety when all else fails.

In Episode 5 the Fierce Earth team explore the phenomenon of the earthquake. Clare and Mike train with one of the top international rescue teams; Leo takes on a dangerous cliff climb with a very special partner; and Dougal and Zoe are in Tokyo to find out how people stay safe in the most earthquake prone city on the planet.

At any one time it is estimated that 2000 thunderstorms are happening across the world. In Episode 6 the team investigate what makes the thundercloud so feared and Leo faces some giant hailstones. Leo and Mike enroll as pylon workers in Florida to find out how the men who do it avoid killer lightning strikes, and we meet the UK boy who cheated death when he was struck by lightning.

In Episode 7 the Fierce Earth team takes on one of the most feared forces on the planet - the Volcano. Dougal explores the secret lava tubes of Etna and climbs Stromboli for a face-to-face encounter with an erupting volcano. Meanwhile, Leo finds evidence of a volcano where you'd least expect it.

Tornadoes are rare, but there's nothing more frantic or explosive in nature. In Episode 8 the Fierce Earth Team investigates where the awesome power of tornadoes comes from and what happens when it's unleashed, meeting a nine year old boy in Alabama who was picked up and thrown by a tornado, plus a UK man who survived the worst one ever to hit this country. Leo puts tornado proof materials to the test in a high velocity lab experiment.

In Episode 9 the Fierce Earth Team takes viewers on a journey to one of the world's coldest and most hostile places on the planet - the Yukon Territory in Canada - to study the world's coldest climes. The team meets people who call this frozen place their home and finds out which animals are perfectly adapted to life in a sub-zero climate. They also get first-hand experience of surviving its freezing and life threatening temperatures and Leo attempts to climb a huge wall of sheer ice.

In Episode 10 the Fierce Earth Team investigates what happens when water becomes our enemy and massive floods threaten. Mike heads to Southampton to learn all about the most important flood rescue vehicle - the hovercraft; Clare goes to Boscastle to meet the survivors of the UK worst ever flash flood; Zoe and Leo find out what it's like to be trapped in a car during a flash flood; and Leo takes on the power of fast flowing water. Meanwhile, Mike travels to Holland to learn all about how the Dutch engineers are taking on the threat of flooding - and winning.