The deadly cylon fleet has reached its destination. Their objective - destroy planet earth. Each ship in the fleet carries a single devastating lithium torpedo. Earth shields are up but their power is being drained. You, as commander of earth's last remaining space station, are all that stands between the cylons and earth's total destruction.

As commander of earth's last orbitting space station, your mission is to destroy as many of the invading Cylon fleet as possible before their lethal lithium missiles hit the earth.

As the missiles are guided by on-board computers, hitting the enemy ship with your phaser before the missile hits earth will automatically destroy it.

The Cylons attack in waves of fifty, each wave getting gradually faster. Your phasers are prone to overheating and if overused will cut out for a few seconds (the word 'Out' will flash in place of 'Active').

Earth's shield power is shown in the middle gauge marked 'E-Shields'. When this reaches 1,000, the shields will begin to glow red under the stress of the bombardment.

Your score is calculated under section marked 'Total Score' and an updated 'High Score' is held whilst the program is running.

Beware - If you fail in your mission to save earth, the planet will be destroyed and explode into hundreds of pieces.

You control your phaser sights with the following keys:
Z - Left, X - Right, : - Up, / - Down, RETURN - Fire