In the 24th century, Earth is pounded by solar explosions and abandoned by humans, and the planet is recolonized by a dangerous race known as Kat Men. When the solar explosions died, the humans decide to return to Earth. When the Kat Men refuse to leave, a war droid known as MT-ED, or Multi Terrain Exploration Droid, is sent down to deal with the Kat Men. Accompanying him is Hercules 1, a maintenance and combat droid. When the two droids are beamed down, things take a turn for the worse. Hercules is kidnapped and taken far away to the Kat Men's Nerve Center. It is MT-ED's task to get rid of the Kat Men and rescue Hercules. To do this, MT-ED has to explore fourteen environments and deal with deadly creatures that are within each environment, with each type of creature requiring a certain type of weapon to be defeated. These weapons - including lasers, water bombs, grenades, and rockets - can be picked up along the way, and MT-ED can switch between them with ease. If MT-ED comes into contact with any of the creatures, he is kicked into the air and gets stunned for a few seconds. If this happens, he loses one of his lives. Not all creatures are deadly; some of them will steal whatever weapons MT-ED is carrying at the time. Besides using weapons to kill, MT-ED also has the ability to jump over creatures that may be too slow for him to shoot. When MT-ED finally rescues Hercules, a sub-game needs to be completed. When MT-ED completed this sub-game, the Kat Men's Central Computer is disabled and the Kat Men go back where they came from.

In the 24th century, Earth is pounded by solar explosions and abandoned by humans, and the planet is recolonized by a dangerous race known as Kat Men. When the solar explosions died, the humans decide to return to Earth. When the Kat Men refuse to leave, a war droid known as MT-ED, or Multi Terrain Exploration Droid, is sent down to deal with the Kat Men. Accompanying him is Hercules 1, a maintenance and combat droid. When the two droids are beamed down, things take a turn for the worse. Hercules is kidnapped and taken far away to the Kat Men's Nerve Center. It is MT-ED's task to get rid of the Kat Men and rescue Hercules. To do this, MT-ED has to explore fourteen environments and deal with deadly creatures that are within each environment, with each type of creature requiring a certain type of weapon to be defeated. These weapons - including lasers, water bombs, grenades, and rockets - can be picked up along the way, and MT-ED can switch between them with ease. If MT-ED comes into contact with any of the creatures, he is kicked into the air and gets stunned for a few seconds. If this happens, he loses one of his lives. Not all creatures are deadly; some of them will steal whatever weapons MT-ED is carrying at the time. Besides using weapons to kill, MT-ED also has the ability to jump over creatures that may be too slow for him to shoot. When MT-ED finally rescues Hercules, a sub-game needs to be completed. When MT-ED completed this sub-game, the Kat Men's Central Computer is disabled and the Kat Men go back where they came from.