Following a terrorist bombing that kills his only daughter, renowned bio-geneticist Professor Shinigami fuses her cells with those of her favorite rose. When an earthquake nearly destroys the rose, he also integrates Godzilla cells—collected by the Japanese government for study after The King Of The Monsters' last raid on Japan—into the plant to grant it immortality. The same terrorists seek the G-cells and threaten to unleash Godzilla again if the Japanese government does not comply with their demands. Soon, Godzilla returns and heads toward the genetically modified plant, which has mutated into the colossal horror known as Biollante!