Sam "Serious" Stone, the last surviving member of the Human race, must make his way across time and several continents to defeat Mental, the overlord of the aliens invading Earth.Sam "Serious" Stone, the last surviving member of the Human race, must make his way across time and several continents to defeat Mental, the overlord of the aliens invading Earth.Sam "Serious" Stone, the last surviving member of the Human race, must make his way across time and several continents to defeat Mental, the overlord of the aliens invading Earth.