Thunder Force IV is a shooting game for the Mega Drive, published by Technosoft in 1992.
In space year 980, a colossal battle was fought between the Lohum Empire and the Galactic Federation, the latter being victorious. However, the empire's computer system could not be completely destroyed and has been recovered by Kha-Oss, an ally of Lohum.
In a desperate attempt to prevent a new war, the Federation sends its latest combat prototype, the Fire LEO-04 Rynex space fighter, on a suicide mission to take out the Vios supercomputer and annihilate the entire Kha-Oss armada.
