Serious Sam, or Sam Stone, is the protagonist of the Serious Sam series. He is a member of the Earth Defense Force, a global military organization that fought against Mental's alien army during the Mental War. He worked himself up in the ranks until he was promoted to Captain. His skills, bravery and commitment to the cause led him to becoming a well-known member of the EDF, a member of Howard Brand's personal Alien Artifact Acquisition team and a legendary hero for all of mankind.