The Gōdom Civilization is a mysterious civilization that once ruled the sea 40,000 years ago and worshiped the Destruction God Gōdom (Hakushin Gōdomu) that came from outer space. With the Organs (the Heart and Brain) of Gōdom (both Precious relics) as their underwater power source, Gōdom ruled the world as "gods" themselves until they were sealed at the bottom of the ocean by those who feared their power. However, it was due to Masumi and Natsuki that the seal was broken and its sole survivor, Arch Priest Gajah, was released from suspended animation. The Gōdom Civilization, in addition to wielding mystic powers, also has technological know-how in creating the Gōdom Engine.
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Several Combatant Karths were part of an army of past enemy grunts that were fought by the Gokaigers in Los Dark's ghost dimension which housed the 1500 spirits of the villains defeated by the Super Sentai. After losing some of their number in an initial skirmish, the remaining members from each grunt group merged to form the Combined Combatant. Though the stronger opponent, the Combined Combatant proved to be unstable due to internal conflicting among the grunts composing him over who got to finish the pirates off. Taking advantage, the Gokaigers used the Battle Fever J Ranger Keys to destroy the Combined Combatant with the Penta Force cannon.