Turrican

The lost colony of Alterra is a completely man-made world in a nearby galaxy, abandoned long ago. Alterra consists of five self-contained habitats, separately bio-engineered by a powerful ecosystem generation network known as a Multiple Organism Unit Link, or MORGUL for short. Early colonists used MORGUL to render Alterra habitable, but a cataclysmic earthquake severed all system interface functions, and MORGUL murderously rebelled. The few colonists lucky enough to escape told a grim tale of a higher intelligence gone berserk.

For generations, mankind sought a return to Alterra. Finally, genetic science created a saviour: Turrican, a mutant warrior, bio-engineered for the task of planetary reclamation. In the meantime, MORGUL has diligently twisted Alterran life forms to his brutal, destructive purposes. Thus, Turrican's challenges consist of eliminating hostile organisms from Alterra's five multi-level worlds and, finally, destroying the three faces of MORGUL.