'depends on how you define alien,' the doctor Said Simply. 'they were human once.' in 2006 the world is about to be overwhelmed by a disaster that might destroy human civilization: the inversion of The Earth's magnetic f...'depends on how you define alien,' the doctor Said Simply. 'they were human once.' in 2006 the world is about to be overwhelmed by a disaster that might destroy human civilization: the inversion of The Earth's magnetic field. Deep in an antarctic base, the flipback team is frantically devising a system to reverse the change in polarity.