The series features various subjects related to science and technology. Some of the views expressed might be considered fringe or pseudo-science. Episode 2 Super Volcano - In spring 2003, strange things began happening in America's most famous national park, Yellowstone. The tallest geyser in the world, which can go 50 years without erupting, burst into life. There were new cracks in the ground, the ground heated up to the point where the National Park Service had to close some trails. Not long after, a group of bison collapsed and died, victims of poisonous fumes from below the ground. Satellite pictures revealed that something ominous was happening beneath the earth ...