Mazinkaiser SKL (Season 1)

Behind a gravity curtain floats Kikaijima, a colossal island quarantined since the last world war. It’s a lawless prison junkyard of robot machine superweapons from a forgotten age of massive military might. Upon receiving a warning that the unstable island’s reactors will detonate and possibly vaporize the world in just a few days, the Japanese government awakens Kaiser- the most powerful and destructive robot ever created! Judgment day has arrived when the towering Kaiser rockets-off to the island to engage in a thunderous robot-crushing battle to save the planet!