The super volcano under Yellowstone erupts after thousands of years, putting millions at risk, and it's up to Rangers Charlie Young and Kate to save the day.The super volcano under Yellowstone erupts after thousands of years, putting millions at risk, and it's up to Rangers Charlie Young and Kate to save the day.The super volcano under Yellowstone erupts after thousands of years, putting millions at risk, and it's up to Rangers Charlie Young and Kate to save the day.