Magma Taishi

An alien named Goa intends to conquer Earth and tests his power by taking the Murakami family—Atsushi, Tomoko, and Mamoru—to a prehistoric jungle where he destroys a giant dinosaur. Refusing to surrender, the family is aided by 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 against Goa. Magma and Mol form a bond with Atsushi and Mamoru, particularly the latter, whose desire for a child inspires Earth to create a duplicate named Gam. Mamoru is given a whistle to summon Magma, Mol, and Gam during emergencies. As Goa deploys various daikaiju, the trio is likely to intervene and provide assistance.