Deep in the geological record, scientists have uncovered evidence of a catastrophic event that once gripped the entire planet in a deep freeze. This gripping documentary explores the radical theory of a Snowball Earth, where massive glaciers crept from the poles to the equator, encasing the world in ice and threatening all life. Through the eyes of researchers hunting for clues in the arid Flinders Ranges of Australia, the film pieces together the mystery of how our planet could have frozen over and what triggered the dramatic thaw that eventually paved the way for an explosion of complex life.