At a bachelorette party in a nightclub, the bride tells 2 guys offering blow to go away. They abduct her. The groom's 2 big brothers looked after their kid brother as kids and do so now again as veterans, "looking" for her and the 2 guys.

Ryan Walker mysteriously awakens MECH-X4, a giant robot built to defend Bay City against impending doom. When monsters begin to descend, Ryan recruits his two best friends and his brother to help pilot the robot that is their only hope of saving their town from mass destruction.