A gladiatorial contest between a ram-jet, which we are all rooting for, and spinning saucers in various hues. Shades of Cyclons in that is it good policy to lure them into a collision; this can be more convenient than blasting. The alien pilots display intelligence, so it's up to you to summon up more. Apart from ramming they also let fly with bombs.
No complications, no frills; just a straightforward battle with nine skill levels... which is ok as part of the collection, but not so hot if you only own three or four tapes. Middle-of-the-road graphics and sonics, too. But the action at least is continuous and furious.