Ambassador Magma

The alien conqueror Goa threatens to take over Earth and begins by warning the Murakami family-father Atsushi, mother Tomoko, and son Mamoru-of his plans. To prove his power, he transports them to a prehistoric jungle and destroys a giant dinosaur right in front of them. But the family refuses to submit to Goa. Their hope arrives in the form of Magma, a golden, armored giant with long hair and antennae, and his human-sized wife, Mol. Both were created by the wizard Earth to defend the planet against Goa. Magma and Mol befriend Atsushi and Mamoru. Magma is particularly moved by Mamoru, as he and Mol had longed for a child of their own. Earth grants their wish by creating Gam, a duplicate of Mamoru. Earth also gives Mamoru a whistle to summon Gam, Mol, and Magma whenever danger arises. So when Goa sends his monstrous daikaiju to attack, the trio is ready to fight back.