There is one on each of the three planets, where they will help you defeat the robot monsters. Sir Gawain is on the Ice Planet (X-73 Y-83) where he will give you the Force Shield to defeat the...
The knights will tell you of a secret asteroid hidden in the Asteroid Belt. Go there, and you will find it near X-11 Y-84. You will need all three knights to pull out the Golden Key and open the...
You get the Cosmic Symbols password from a girl in the upper part of the Mill. You will need the Secret Message (in the Princess's Maid's room, first floor left in the castle).
Go to the fountain...
The crashed saucer Excalibur will get you into space. Get a new spaceship at the Pewter Moon and you can travel around the solar system. The card the Queen gave you has the coordinates for the three...