Your citizens have been captured and forced to work in the alien mine.
The enemy power crystal is hidden deep within a subterranean network.
Its your mission to rescue them and destroy the crystal in this 'Defender In a Cave' type game.
Staying loyal to the game, the graphics and sound have been enhanced and a bug on the last level sorted out so you can actually complete the game.
Also added a secret level :-)
This is an old remake and may not work on newer systems.