Little did we know that the Nazis have been secretly hiding on their Moonbase, poised for attack. The brand new trailer for Iron Sky takes us into their mind-wiping space colony, and shows off their outer space army!

Also in this trailer is the film's official release date: April 4th 2012. The creators of Iron Sky are presenting a new promo at this year's Cannes Film Festival, and it should be interesting to read the crowd's reaction. Least we forget Dod Sno, a film about Zombie Nazis, was pretty popular hit for a small foreign film. And Iron Sky seems even more ambitious than its alternate history Nazi predecessors. Here's the synopsis:

As World War II comes to an end in 1945, Hans Kammler and other German scientists make a breakthrough in anti-gravity research. From a secret base in the Antarctic, Nazi spaceships are sent to the "dark side" of the Moon to establish the military base "Schwarze Sonne." Their plan is to build a powerful fleet and return to conquer Earth. The film is set in the year 2018 when their descendants finally return.