Rygar is a side-scrolling and overhead action adventure arcade game with light RPG mechanics that was ported to many different consoles and home computers including: Arcade (original),Sharp X68000, C64, ZX Spectrum, Amstrad CPC, NES, Master System, Lynx, Mobile, Virtual Console, PlayStation 4, Commodore Amiga.
Players control the "Legendary Hero", who rises from his grave wielding his "diskarmor" against a variety of strange foes across many types of post-apocalyptic landscapes in an attempt to stop Ligar, an evil villain who has taken over the land of Argool. Little bits of story can be gleaned from the sages/gurus in the game, but the original arcade intro also offers some clues. "4.5 billion years have passed since Earth's creation. Many dominators have ruled in all their glory, but time was their greatest enemy and it defeated their reign. And now a new dominator's reign begins..."
Music: The music for either the NES or Famicom versions was composed by Michiharu Hasuya who would later reuse one Rygar's tracks on the title screen of Dr. Jekyll and Mr. Hyde. The American NES version replaced some of the soundtracks from its Famicom counterpart but is otherwise graphically identical, save for the title screen and language. ( source: https://en.wikipedia.org/wiki/Rygar )