2199 AD. Yamato tried to leave behind the Large Magellanic Cloud galaxy, after receiving a Cosmo Reverse System at its destination, Iscandar. However, suddenly, it encounters a mysterious group at the edge of the Large Magellanic Cloud. The crew finds out that the group is called the Gatlantis, and that its leader is the Gutaba expeditionary force commander who calls himself Goran Dagaamu of Thunder. The commander demands that Yamato be handed over to him. Yamato, wanting to hurry to Earth, escapes the fray. However, Yamato is attacked by a devastating beam weapon called the Flame Direct Attack Cannon that can transcend space. Yamato was able to retreat, but ends up getting lost, and finds itself in a strangely colored irregular dimension. The crew decides to turn off the engine on the ship, and explore a mysterious planet. In order to collect information, Kodai, Kiryū, Sawamura, Niimi, and Aihara land on the planet. What they saw when they arrived was a ship that was not supposed to be there. Dagaamu chases after the traces of Yamato's warp, and also reaches the strangely colored space. The planet on which Yamato landed was in fact what Dagaamu had been looking for all along. (Source: ANN)

A 45-minute recap episode of the first season, narrated by Sanada-san.

Haruka finds a cat in an abandoned building and names it Nyan. Little does she know that this cat is actually Ultra-Nyan who has come from outer space. Using his mysterious powers, Ultra-Nyan helps Haruka and her friends foil the plans of a couple of no-good catnappers.

Duke Fleed is a survivor of the Fleed Planet who is escaped to the Earth, onboard a mysterious spaceship, where is raised by Dr. Umon as his adoptive son, and known as Daisuke Umon. Years after his arrival, he's faced with the threat of King Vega and his army, who want to conquer the Earth. With his friends Koji and Hikaru (and later his younger sister Maria Grace), Duke decides to fight back using his best weapon - the almighty Grendizer.