Knowing that Commando Cody's spaceship has special equipment that allows it to pass back and forth through the cosmic dust blanket that protects the Earth, The Ruler comes up with a plan to steal the ship and use its technology to build a fleet of ships with the same capability, thereby enabling him to finally invade and conquer the Earth. He sends a spy posing as a defector to convince Cody to travel to the planet Mercury, which is occupied by The Ruler, and take over the ship on the way there and deliver it--and Cody--to The Ruler.
—frankfob2@yahoo.com