in North America) is a fixed shooter video game for the Philips Magnavox Odyssey², a console released in 1978.

The Merciless Monstroth (an eye shaped enemy that constantly moves back and forth across the top of the screen) leads the invasion force of 8 robots.

The shields constantly move back and forth giving both the player and the enemy the opportunity to fire.

If the player's laser cannon is struck, they will be defenseless unless they retreat to under one of the three large black shields.

Once the player fires, the shield will disappear and the laser cannon will reappear.