The team investigates wildfires and discovers how they rage all over the world leaving a trail of devastation and destruction. We travel to Colorado and meet 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 neighbourhood was burnt down. Zoe experiences first-hand what it feels like to try and outrun a wildfire and Leo is challenged to see how long he can survive in raging heat of up to 800 degrees in a special fire chamber experiment.