Here's the story so far:

Aliens where seen on moon.
The scientists have observed the aliens are building a huge laser canon and it's pointed to the earth.
They must plan to destroy the human mankind!

There is just one hero to prevent this: SUPERULI!

SUPERULI jumps in his (selfconstructed) space shuttle and proceed to the moon.
Right after landing on the moon he's getting attacted from these aliens.

But SUPERULI proceeds to the alien base and further on to... (but thats part of the game )