Space hawks fly across the screen and lay eggs which hatch upon landing and try to devour you. The birds then pass on and snatch up a human and attempt to fly off with them.
All you have is a laser base with which to shoot them down but beware, they need two shots to kill them, although the human is freed after the first. If you miss then all you see of the poor being is his skull fall from the sky (yuk).
That, in brief, is the plot and it sounds more exciting than the game proved to be.
The problems I found were that more than half the bullets went straight through the birds without leaving a mark.
After losing all four of your lives, you have to use the same keys to enter your name in the high score table, which makes it a very fiddly business to say the least.
The table itself was only displayed for a fraction of a second and nothing I could do would keep it on the screen long enough to read.
Although the graphics were adequate, I wasn't much inclined to play this game again.