In the original storyline as aired in Japan, Dairugger XV was simply an exploration robot, as well as an intended peace-keeping force. The Earth is in a time of prosperity. The president of the Terran League (the Galaxy Alliance in Voltron) launches a mission to explore beyond the galaxy. After commencing its mission of exploration, the starship Rugger-Guard is attacked by a ship of the Galbeston Empire. Dairugger, the super robot, is deployed in order to defend the Earth. It is somewhat by fate that they must help the people of Galbeston find a new planet before it explodes, and liberate it from its despotic Emperor. In the Japanese version, it does not have anything to do with King of the Beasts GoLion, as opposed to the U.S. version, Voltron: Defender of the Universe. There are three assault team units: Land, Air, and Sea. There are a total of 15 parts referred to as Rugger, which can combine together to form the super-robot Dairugger. The design of the 15 separate Rugger units came from the sport of rugby, since 15 players are required to form a rugby union. The U.S. version would rename the Galbeston Empire to Drule Empire, along with editing a fair amount of violence and sexual content to keep the show safe for general audience broadcast. (Source: Wikipedia)

In a small town, there is a small pharmacy called Fun Fun Pharmacy. Popuri, a girl who recently moved in downtown, discovers this pharmacy and meets Miss Fukiko, who is actually a witch. Miss Fukiko gives Popuri a mysterious bottle that can create magic spirits.

When aliens plan to invade Earth, a young boy named Kouta must team up with a giant robot from outer space, Exkaiser, in order to save the world and his friends.

Earth is still in danger: aliens from planet Zeraz are willing to invade our planet because theirs is being swallowed by a Black Hole. Led by Great Darius and his four generals, they begin seeding death and destruction. When an ESP warrior is killed by aliens, professor Hi-Tech understands the danger and builds the huge Space Dragon (Daiku Maryuu) piloted by Pete, and the gint robot Gaiking whose pilot is Sanshiro Shiwobuki, an ex-baseball player. Daiku Maryuu is a big dragon shaped spaceship and his head is the Gaiking torso. When the Gaiking enters the action, Daiku Maryuu launches other Gaiking's components and then it re-unite neck with tail, becoming unbreakable. The story chronicled the battle between the crew of the semi-transformable carrier Daikuu Maryuu and the Super Mecha Gaiking against an invading race of aliens from the planet Zela, whose home planet is facing destruction by a black hole. The robot Gaiking was piloted by a baseball star named Sanshiro Tsuwabuki (Sanshiro's name was changed to Aries Astonopolis for the English version of the show with the carrier being called the Great Space Dragon, a literal translation of Daikuu Maryuu. Gaiking was notable for being one of the few super robot series to take place in real places outside of Japan, and for being the first Super Robot series to have a mobile carrier for the chief robots. (Source: ANN)