Before fighting the Alien Queen, Commander Z, of the aliens, suggested that the Space Miners and the aliens share the crystals. The player follows through, and the aliens were gotten rid of. After going through a crystal powered portal, the communication between the player and the Commander was fuzzy, and the last request from the Commander was to eliminate the aliens. The player soon finds out that the Space Mercenary was hired by the aliens. Upon arriving at Planet's Dark Side, the player gets a request from the Commander of the Galaxy Troopers, to find out the motive of the Space Mercenary for stealing the power crystals. After going through the second part of the Space Colony, the player rides a spaceship and arrives at the Planet's Dark Side. The player, after fighting mercenary troopers and defeating the Battle Bot X-15, completes the task. As the player arrives at the entrance of the Space Command HQ, another commander of the Space Troopers realizes that they need the player's help, and asks the player to rid the headquarters of the Space Mercenary.
The player decides to help anyway, smashing monster plants and Mercenary Troopers along the way. The player decides to help, but was told by a commander of the Galaxy Troopers that they can handle the problem alone, and do not need the help of the player. When the player first arrives at the Space Colony, he discovers that the Space Mercenary has been stealing precious power crystals from the Space Miners.