Keen's mission in this game is to find back the stolen parts of his ship. The evil Vorticons have stolen four objects from the ship and hidden them all in different places on Mars. Commander Keen's Megarocket was constructed from objects found around his house, which have been modified into starship parts. As a manual flight controller, he has used a joystick from his brother's video game. As for electricity, he has used a car battery from his mom's car. A heavily modified vacuum cleaner from their kitchen has been used as a ion propulsion unit. And as for fuel, he has used everclear from his dad's liquor cabinet.