早乙女研究所设计了用于宇宙开发作业用的机器人——盖特机器人；同时，在太古时期曾一度称霸地面的爬虫人类为了重新夺回地上的世界开始了对世界各地的侵略行动。然而盖特机器人的动力源，正是过去将爬虫人类从地面赶进地底的元凶——盖特射线。为了阻止地上人类对盖特射线的开发利用，恐龙帝国的统治者帝王高鲁派遣机械恐龙对早乙女研究所发起了猛烈的进攻。 在首战中早乙女研究所就失去了盖特机器人的原型测试机及以博士儿子早乙女达人为首的三位测试驾驶员；在研究所陷入空前危机的情况下，幸得三名来自浅间学园的高中生——足球部的流龙马、神隼人及柔道部部长巴武藏大力协助；临时被改装成战斗用的盖特机器人才得以逃脱被恐龙帝国魔爪毁灭的厄运，就此一场拯救地上人类世界的正义战斗拉开序幕……。
盖塔机器人 (季节 0)
Great Mazinger Vs. Getter Robo 0.0
播出日期: 1975-03-21
运行时间: 25 min
概述: When a UFO appears over Japan, both the heroes of Great Mazinger and Getter Robo want to investigate it first, out of a sense of rivalry. Getter finds it first since the Mazinger robot is being repaired. However they are unable to defeat the apparently living vehicle. It had already dropped a metal-eating monster on Japan named Gilgilgan and Great Mazinger confronts it only to be badly beaten. Later, despite the robot pilots' protests, their two bases decide to join forces to stop Gilgilgan as he starts becoming more powerful and begins to change. They make a plan to lure it to an empty island where they can battle it without causing collateral damage. They get Boss to lure the monster there where it eats Boss Borot in the process. The combined heroes almost defeat Gilgilgan until the UFO returns and allows itself to be eaten to cause its own creation to grow to its final form. During the intense battle the heroes manage to find its weak points and destroy Gilgilgan. Afterward they promise to be friends from then on.
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集 1