The interstellar spaceship Irata is heading for the planet Zarkaw to take a fresh supplies of food and water. The crew learns that the Targoid insect people have installed powerful reactors in Zarkow's network of caverns to exploit the planet's supplies of energy and raw materials. Thanks to a friendishly sophisticated security system, it's now almost impossible to enter the caverns.

A hand-picked team consisting of the spaceship's five best pilots is chosen to break through the security system and disable the reactors. Their mission is to find the hidden energy sphere's and drop them into the reactors. This will cause the reactors to overheat and thus destroy them.