Doom has attracted plenty of controversy for its high levels of gore, violence and satanic imagery. It was even cited as the inspiration for the young gunmen involved in the Columbine High School massacre in 1999. supplied In this big-screen, 2005 incarnation of Doom, the year is 2046. It is two decades since archaeologists discovered a portal to Mars, deep in the Nevada Desert. But, despite building a scientific base on the red planet, humans are still struggling to work out why the portal was built and what happened to the civilisation that built it. The answers threaten to become clearer when the base's 85 research staff and their families begin being picked off by an unseen menace, prompting the call-back of the Marine Corps Special Operations Rapid Response Tactical Squad from vacation.