Serious Sam is a video game series created and developed by Croteam. The series started on Microsoft Windows and has been released on a number of different platforms, including the Xbox, Xbox 360, Palm OS, Game Boy Advance, PlayStation 2 and GameCube.
Direct spin-offs of the first title in the Serious Sam series were created for PlayStation 2, GameCube and Game Boy Advance by Climax Solent and for Palm OS by InterActive Vision. All of these spin-offs were published by Global Star Software. The fan-made game Serious Sam Classics: Revolution was developed by online community Alligator Pit and released onto Steam Early Access in 2014.
The series follows the adventures of protagonist Sam "Serious" Stone and his fight against the forces of the notorious extraterrestrialoverlord Mental who seeks to destroy humanity.