20 years after the events of Iron Sky, the former Nazi Moon Base has become humanity's last refuge. Earth was devastated by nuclear war, but buried deep beneath the wasteland lies a power that could save the last of humanity or destroy it once and for all. When an old enemy leads our heroes on an expedition into the Hollow Earth, the truth behind humanity's creation will be revealed. To save humanity, they must battle the Vril, an ancient race of shapeshifting reptiles and their army of dinosaurs.