Warning:There are a few spoilers. Any characters and series belong to their respective owners.

Things have taken a turn for the worst. As the fighting between the Earth Federation and Neo Zeon starts to intesify, several alien races started to invade. The Invaders, an alien race thought to have been destroyed in the Lunar conflict years prior have returned. Also appearing alongside the Invaders were the Gauna, a strange and nearly immortal alien race similar to the Invaders. An insectoid alien race also known simply as Space Monsters appeared as well, which caused many of the space colonists to flee to Earth fearing them. Conflict rose, the Federation and Neo Zeon formed a truce to counter these alien threats. They developed new technology, such as the powerful Super Robot, Gunbuster to combat these threats. To help fight with the Invaders, the Federation decided to release the criminal and Getter pilot, Ryoma Nagare, to combat the scientist Professor Saotome who was discovered to have been infected and transformed into an Invader. This war reached it's peak when the Earth Federation decided to launch a nuke at the newly formed Shin Dragon. This caused the Getter Ray Armageddon, an event which spread the cosmic radiation Getter Rays across the planet, and Ryoma Nagare disappeared in the explosion. Somehow, this started to cause the earth to slowly freeze over, so debates were held on what to do. A faction calling themselves Evolvers decided to genetically modify themselves in order to survive in space while another faction opposed it greatly. However, all this fighting woke up the Kaiju, giant ancient creatures. Two alien races, the Exif and the Bilusaludo, arrived with the former attempting to convert humanity to their religion and the latter seeking to emigrate to Earth with promises to defeat the Kaiju. However, their efforts proved for naught when a Kaiju known as the King of the monsters appeared; Godzilla. The only machine the people of earth thought would stand a chance against Godzilla, Gunbuster, had disappeared into space to attack the Space Monsters. The Bilusaludo tried to construct the machine MechaGodzilla, but their efforts were in vain and the machine remained unfinished. It was decided then that humanity would flee the Earth in hopes of finding another world to live on alongside these Alien races. While the Evolvers and the faction that opposed them continued to bicker, several different ships, each equipped with different technology, fled the Earth. Those that remained fled underground, but due to the cold, some of the people ended up in an improper Cryogenic freeze. Humanity was no longer the dominant race of Earth.

A thousand years have passed. Much of the Earth has been flooded due to the thaw of the Ice age and what few land that remains has been turned into a desert due to humans harvesting an energy source known as Magma energy. On the sea, fleets of ships join together for continued survival, while on land several groups fight against a monsterous race called the Klaxosaurs. However not everywhere is humanity a shell of its former civilization. A rebelion from the people who lived underground against the warlord Lordgenome has resulted in Kamina City, a city which utilizes the powerful energy Spiral Power. In this city there exists the man Simon, hero of the war and pilot of Guren Lagann who serves as symbol of hope across the whole planet. Also, several governments, including a people on the moon known as the Moonrace, have now awoken and plan to try and reestablish themselves alongside these new governments and space colonies.

In space, the Evolvers have now become the Hideauze and the faction that opposed them the Galactic Alliance of Humankind. They continue to fight with each other, with the Alliance forming what people might call a dystopian society where the sick and elderly are disposed of. But some ships have yet to meet one another. One ship that was equipped with an experimental hyperdrive has only experienced a few years since they fled Earth. The people of this ship are starving and a few have actually comitted suicide, and to make matters worse, the planet they fled to was discovered to be uninhabitable. There also exists the Sidonia, another ship that fled Earth. On this ship, humans have undergone extensive genetic modification. They now photosynthesise and clones and hermaphrodites are common place. This ship is in a constant state of war, worried about the Gauna. However, among the ships, one in particular has survived across the thousand years with little change: the Nobunaga. The purpose of this ship was to not only preserve humanity, but history, culture, and super robot technology as well. This ship's main culture is reminiscent of traditional Japan, including samurai. They have taken many steps to handle the lack of resources. The people of the Nobunaga use swords instead of guns, so resources aren't wasted making ammo. They have also genetically modified the plants and cattle to grow and reproduce at much faster rate. This of course means the have a shorter lifespan and must be harvested quickly, but there have been little problems with that. The people have also discovered a way to domesticate the Hideauze, with many unique species on the ship. This has of course had the Alliance label them as enemies but the Nobunaga's government, which is lead by a Daimyo like captain, and people feel the same way about them. They are disgusted by the Alliance, and would rather wander space and never find a new planet than join the Alliance of Humankind. However, slumbering deep within the ship is a dragon that will lead humanity on it's return home.

This is Super Robot Wars: Return

Series List:

Getter Robo Armageddon

Getter Robo (Elements of Original Series)

Knights of Sidonia

Shin Mazinger Z (Elements of Shin Mazinger Zero)

Darling in the Franxx

Godzilla trilogy (Planet of Monsters, City on the Edge of Battle, The Planet Eater)

Mazinkaiser

UFO Robo Grendizer

Zeta Gundam (units only)

ZZ Gundam (units only)

Mobile Suit Gundam:Char's Counterattack

Gundam G in Recougnista

Turn A Gundam

Mobile Suit Gundam:Hathaway's Flash

Mobile Suit Crossbone Gundam

Mobile Suit Gundam 0080: War in the Pocket

Gargantia on the Verduous Planet.

Aim for the top:Gunbuster (units only)

Diebuster

Gurren Lagann The Movie: The Lights in the Sky are Stars

Invincible Superman Zambot 3

Invincible Steelman Daitarn 3

Devilman Crybaby

The Big O

Space Pirate Captain Harlock

Detonator Orgun

Appleseed

Combat Mecha Xabungle

Originals

(Several other series, although not a part of the story itself, will be mentioned late into the story)

Authors Note: Hey, its been a long time since I posted anything. I have had the idea for this floating around in my head and have now posted it for everyone to see. It might be a while for me to get a chapter up. I am not sure my skills are good enough yet, plus some of two of these series aren't finished yet. So, I guess you could say this is a future preview. If there is anything that needs fixed or added, please review on what needs to be done. If you also think there are any other series I should add, let me know. I hope will be able to write this.