Five humans have been trapped in an alien space station and you must guide them one at a time to reach the air-locks so that they can escape.
That's the scenario. What actually happens is that you move a little stickman from the top to the bottom of the screen by dropping him through a series of sideways-moving boxes. Then you do the same again four more times.
You are of course being chased by a number of randomly-moving monsters: one to start with, and an extra one for each stage you get through.
If you can get all five of your humans down you get a 1000-point bonus which is fun, and every few stages you are kindly awarded a bonus man.
The graphics are fast, but unconvincing. The game is enjoyable for a bit, but there's not enough strategy to make it a sufficiently interesting long-term proposition.