Rent Guyver: Dark Hero (1994)

The Guyver is the ultimate weapon. A mysterious 'Mecha' of alien design. When activated the unit interfaces with human subjects, transforming them into powerful combatants. Something alien has invaded the body of Sean Barker. A force which now lives within him The ultimate power of the Guyver. Searching for the truth about the Guyver and his own destiny, Sean is drawn deep into the caves of Utah. But, to his peril, he also discovers the Krunos Corporation, a corrupt alien corporate empire with two deadly aims. To steal the super human power of the Guyver and his armour and then take control of the Earth...