Zillion

The White Knights, a peacekeeping force of the Planetary System, have a mission: prevent the evil Norsa Empire from dominating the world. The Norsa base on Planet X must be destroyed: an operative named JJ is sent to infiltrate it and collect the five floppy disks that will enable him to input the self-destruct sequence into the base's mainframe computer. However, beside completing this main objective, JJ also has to find a way to rescue his friends, Apple and Champ.

JJ uses a gun similar to the Sega Master System Light Phaser to defend himself and blast open the capsules. Upgrades for health, speed, jumping ability, and gun power can be found; Opa Opa, a character from Fantasy Zone games, provides character enhancements.

Once Apple or Champ are rescued, they can be controlled by the player, with the ability to switch between the three heroes. Each of these characters has his/her own strengths and weaknesses; Apple is physically weaker, but is able to jump higher, while Champ is stronger, but slower.