Son of Godzilla

怪獣島の決戦 ゴジラの息子

Also known as Monster Island's Decisive Battle: Godzilla's Son, O Filho de Godzilla, Godzilla - Frankenstein jagt Godzillas Sohn, Син Ґодзілли, Kaijûtô no kessen: Gojira no musuko

“A great duel against a new monster by a parent-child combination!”

Reporter Goro Maki stumbles upon scientists conducting weather experiments on Sollgel Island in the South Seas. He discovers the island is inhabited by giant mantis and a woman named Saeko who's been cast away since the death of her father. The pair soon find a helpless infant monster that Godzilla must adopt and learn to raise as one of his own.