简介：外星人试图使地球失去引力，这时，只有圣诞节的馈赠精神一个叫做X 的小外星人才能拯救世界。

简介：A seasoned Free Stalker tasked with guiding a band of Mercenaries deep into The Zone to investigate a paranormal radio signal. Based on the S.T.A.L.K.