Codename: Intruder

"Our sensors are detecting a fast approaching UFO in Flashing Gamma Star, our early warning orbital station. Our intelligence shows that this intruder is hostile..."

As the intruder you have to pilot your starfighter through 5 different action stages, trying to survive and destroy the final bosses, one per stage. The player starts with 3 opportunities (lives) and it is possible to get more during the game play.

Defenders will try to stop the player's starfighter with different defence systems, such as automatic & static defences, manned spacecrafts, guided bombs, etc.