29 years after the events of Iron Sky, the former Nazi Moonbase has become the last refuge of mankind. Earth was devastated by a nuclear war, but buried deep under the wasteland lies a power that could save the last of humanity - or destroy it once and for all. An old enemy leads our heroes on an adventure into the Hollow Earth. To save humanity, they must battle the Vril, an ancient shapeshifting reptilian race, and their army of dinosaurs.

The third part in the original Iron Sky continuum takes the story to the hidden Russian megapolis in Mars, the red planet.

Two Chinese university dropout audiophiles set out on a quest to decode a mysterious message received from the Moon, but quickly find themselves fighting against the mother of all conspiracy theories – the Illuminati.