Three new trailers from S.T.A.L.K.E.R.: Clear Sky have been released, showcasing the official prequel to the survival FPS game S.T.A.L.K.E.R.: Shadow of Chernobyl, due to hit the store shelves on August 29, 2008. Developed by GSC Game World, S.T.A.L.K.E.R.: Clear Sky is a survival FPS game for PC based on a 'what-if' scenario of the second Chernobyl Nuclear Power Plant accident. The story of the game brings the players one year prior to the events of the original S.T.A.L.K.E.R. game in 2011. The protagonist is a mercenary who appeared at the edge of the opposition between stalker factions, Strelok and even the Zone itself. The main character will have to play the key role in the events, which led to creation of the Zone up to the point from which the original S.T.A.L.K.E.R. game begins.