Ambassador Magma

An alien conqueror named Goa threatens Earth and targets the Murakami family-father Atsushi, mother Tomoko, and son Mamoru-as his first warning. He transports them to a prehistoric jungle, destroying a massive dinosaur to prove his power. When the family refuses to surrender, 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. Magma and Mol befriend Atsushi and Mamoru, with Magma growing especially fond of the boy since he and Mol wish for a child of their own. Earth grants their wish by creating Gam, a duplicate of Mamoru, and gives Mamoru a whistle to summon Gam, Mol, or Magma in emergencies. When Goa sends his monstrous creatures to attack, the trio stands ready to fight back.