Get out of here stalker!
This page contains spoilers to the game's final plot. It is advised you skip this section or page if you haven't completed the game yet!
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Unlike the other games' multiple endings, Clear Sky has only two possible endings. This is most probably because the game is a prequel and the storyline must be linear to accommodate future events.
Strelok is incapacitatedEditIf Scar manages to neutralize Strelok's Psi protection before he gets to the power plant, the Zone will seemingly go stable for a moment but to Lebedev's horror continues building up energy and finally releases it all in a massive emission. This emission obliterates the Clear Sky faction almost completely, killing or incapacitating everyone but two survivors. Scar's fate isn't revealed, but it's presumed to be quite similar. Strelok is then seen being brainwashed, along a large group of stalkers, when his arm moves and we can see the S.T.A.L.K.E.R. mark on his arm.
Strelok makes it to the centerEdit
While this ending isn't accompanied by a cinematic cutscene and isn't canon, it's a possible outcome of the final scenario.
If Strelok makes it to the CNPP, Lebedev will panic at the massive energy spikes he is reading and the zone readies a very lethal emission. The last thing heard on the comms are Lebedev's frantic voice and then an emission breaks out, killing the player, and presumably destroying everything inside the Zone and leaving it as a completely lifeless, highly anomalous territory.