You are Otto Matic, the robot who, in the year 1957, is given the job of saving Earth from the clutches of The Giant Brain from Planet X. You must rescue as many humans as you can while defeating the Brain Aliens and all of their evil followers. Your mission will take you to strange and fantastic alien worlds which are often treacherous and will require Otto to perform amazing feats.
Your rocket ship will take you to each of the planets, starting with Earth. While on each planet you must save as many humans as you can, but be careful because the Brain Aliens will try to abduct the humans before you can save them. When you save humans, they are teleported to your rocket ship. To escape the planet you must also collect rocket fuel. Once The Giant Brain has been defeated and peace restored to the galaxy, you will return to Earth with your human cargo where they will be freed.