On June 23, 2009, a game for the Nintendo DS known as Devil Survivor was released in the United States. It was a story about a group of people who find themselves trapped in a lockdown of Tokyo as monsters and gods from various pantheons wreak havoc, their only means of survival being their ability to summon and control said mythological beings. On August 23, 2011, an expansion to this story was released for the Nintendo 3DS by the name of Devil Survivor Overclocked.