Serious Sam 2 (Part 2 - Stage 2)

Serious Sam 2 is a first-person shooter video game released for Microsoft Windows and Xbox and the sequel to the 2002 video game Serious Sam: The Second Encounter. It was developed by Croteam and was released on 11 October 2005.
In the single-player campaign, the player assumes the role of hero Sam "Serious" Stone in his adventures against the forces of the extraterrestrial overlord, "Mental", who seeks to destroy humanity.
Sam travels through various worlds collecting parts of a medallion in an effort to defeat Mental. He is guided by the Sirian Great Council and receives sporadic aid from the natives of the worlds he visits.