The story really begins when a mecha lion carrying a baby plummets from the heavens in front of a young couple in a mini-bus. Naturally they adopt the child and the lion zooms off into the the sky. We move 8 years later. The earth is under attack from hostile alien monsters who have a huge undersea base. They have the ability to infect humans with a alien alloy turning them into machine creatures. These creatures can then merge with other machinery and morph into monstrous mecha with awesome destructive powers. These mecha also tend to be shaped, and act on, the obsessions of the human who was chosen as the basis. And our only defense is the obligatory secret super-science organization, who also have an undersea base. They've got a wider variety of characters and even wider variety of mecha and gadgets. However at the heart of it all is Kai, a guy who has been re-born as a cyborg and is at the heart of Gaogaigar, their most powerful weapon. <br />