The world is on the brink of apocalypse following an onslaught of invaders. To fight the attacking hoard, one of the original Getter Robo pilots, Jin Hayato, has finished Getter Arc, a new fighting unit based on the final work and ultimate masterpiece of Professor Saotome. Now the son of Ryouma – one of Hayato's copilots on the first-generation Getter – Takuma, the half-human half-Saurian Kamui, and Baku, younger brother of the extraordinary ESPer Tahir, step aboard the Getter Arc to combat the ruthless incursion and restore hope to their ravaged world!

Source: Sentai Filmworks

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Alternative setting: Getter Robo