On 11 February 2009, it was announced that the film would star German actress Julia Dietze, while the Slovenian industrial music group Laibach would be recording the soundtrack. Appropriately enough for a film about Nazism, the orchestral soundtrack incorporates leitmotifs from the operatic cycle "Der Ring des Nibelungen" and other operas by Richard Wagner, a composer whose music was favoured by the Nazi leaders. The national anthem of the Nazis from the Moon ("Kameraden, wir kehren Heim!") has the tune of "Die Wacht am Rhein". During the 2010 Cannes Film Festival, "Iron Sky" signed a co-production agreement with the Australian production company New Holland Pictures, which brought Cathy Overett and Mark Overett as co-producers of the film.