In the picture reveals the essence of the destination and the mechanism of functioning of the "cube" is a fantastic building, consisting of moving rooms. The mysterious government organization puts inside the cube people to explore their reaction to the effects of the various deadly traps. Eric Wynn - the operator monitoring the system and watching the people trapped in the cube. Once he notices that inside the cube came the woman, Cassandra rains, which did not sign the agreement on a voluntary hit in cube. Eric realizes that Cassandra was a random victim and mistakenly put in the cube. Breaking all the rules, Eric decides to go to the cube to rescue Cassandra. But the security starts to chase them inside the cube.