The Calico discovered an island on the one night it became visible again after thousands of years of invisibility. The Siren Sisters who inhabited the island wanted to have the crew prisoner for all eternity, but Godzilla arrived to prevent that. The Chimera was accidentally released and the two began battling, but the Chimera was no match for Godzilla and was pushed back into its prison. Later, after capturing most of the crew, the Siren Sisters all combined into one to awaken and control the Chimera. When Chimera gripped Godzooky, Pete managed to awaken Godzilla who started to fight Chimera again. Knowing the Chimera couldn't beat Godzilla alone, the sirens joined with the Chimera to increase its power. This strength made no difference to Godzilla, who tricked it into falling off the cliff and diving into the sea, awakening the Calico crew.
Will be destroyed if it enters water, transforming into smoke.