The AI Robot brothers HouRyu and EnRyu have sucessfully completed Sytem Change and sortied alongside GaoGaiGar, but the firey, brash HouRyu and the cold, cautious EnRyu have opposite personalities. Will they be able to unite their purpose long enough to combine using Symmetrical Docking? If they can't, they won't be able to save GaoGaiGar, who is on a mission to rescue Mamoru from the depths of the ocean.
Gai is fighting a giant Zondar robo 10,000 meters under sea level, but his protective Arresting Field has failed. Can bravery fight against 1,000 kg of pressure per square centemeter?
Includes the shadowy first appearence of the inteligence analysis AI Robot, Volfogg!
Spoken Languages: English, Japanese, English subtitles.