S.T.A.L.K.E.R.: Call of Pripyat takes place shortly after the events of its predecessor, S.T.A.L.K.E.R.: Shadow of Chernobyl, in which an open path to the Zone center was discovered by the government who then decided to launch a large-scale military Fairway operation with the aim of taking control over CNPP (Chernobyl Nuclear Power Plant). However, their plans fail due to most helicopters crashing and Ukraine's Security Service send their agent into the Zone center to investigate what happened and why it failed - leaving everything up to the player from that point onwards for them to explore and discover as they play through this video game developed by GSC GameWorld

S.T.A.L.K.E.R.: Clear Sky is a video game set one year before the events of its predecessor, S.T.A.L.K