A brave robot volunteers to combat the mechanoid minions of a mad scientist bent on world domination.

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In the year 220X, 5th grader Subaru hoshikawa, mourning his father's death, is given an invention, made by his father, called a visualizer, which allows him to see radio-wave based aliens, which are trying to destroy the world. Together, with an alien named omega-xis, he fights to save the earth.

20XX年，邪恶的科学家威利博士企图利用机器人征服世界，得知此事的家务机器人洛克请求主人·爱好和平的莱特博士将其改造为战斗机器人。经过一番改造，洛克成为战斗机器人·洛克人，并开始了与威利博士制造的机器人的战斗。