Dark Side

The game is set on the alien moon Tricuspid orbiting the planet Evath. Terrorists (the Ketars, the villains of the first game Driller) hijacked the moon's facilities and built Zephyr One, an immense beam weapon on the moon's dark side with the purpose of destroying Evath.

The player is a government agent, sent secretly to the moon's surface with the mission of deactivating the weapon before it becomes fully charged.