The ultimate goal of the game is to collect five parts for a rocket ship and 500 units of lunarium to get to the Moon and close down the mines. But as it turns out, the Nazis were not the only party involved: An "Interplanetary Union of Fascists", which was formed by aliens, have struck a deal with the Germans, aiding their world conquest with their technology. In order to achieve final victory, the Rocket Ranger must battle one of these aliens.