The story takes place in unnamed timeline, where humanity has highly advanced technology. However, the human population is decreasing and it seems that they're on their way to extinction. 
The protagonists are Leos Alloy, Sthesia Awar and their Haro. They work on a Jupiter base called "Jupiter X", using "General Answer" (or "GA") which contains a massive repository of data about the alternate history of Humanity, Leos travels to the Earths' of the alternate timelines in an effort to collect data that might give them a hint for the evolution of mankind. 
(Source: Gundam Wikia)

In C.E. 73, tensions between Naturals and Coordinators continue to persist, eventually leading to another war between the Earth Alliance and PLANT. Sven Cal Bayan is a Natural pilot of the elite EA squad, the Phantom Pain, and carries out his squad's various anti-Coordinator missions without fail. Selene McGriff is a Coordinator researcher at the neutral Deep Space Survey and Development Organization (DSSD) and a developer of the GSX-401FW Stargazer space exploration mobile suit. Though their backgrounds are completely different, the expanding war will nevertheless force their paths to collide.
 
(Source: Anime News Network)

This story is set thousands of years in the future. The people of Earth have forgotten the space wars of the past, reverting back to a pre-industrial existence. But the lunar settlers known as the Moonrace, who have retained their high technology, now plan to seize their mother planet for themselves. As the war of the worlds begins, a young Moonrace citizen named Loran Cehack, pilot of the legendary Turn A Gundam, struggles to bridge the gap between humanity's long-separated branches. 
(Source: GundamOfficial)

What would you do if you suddenly found yourself in the middle of a war? Teenager Amuro Ray sees his life shattered when war comes to his home. During the chaos, Amuro finds himself inside the mobile suit Gundam, the Earth Federation's new secret weapon, and he somehow gets it to work. Amuro and the other refugees flee their homeland on the warship White Base. This group of children and inexperienced soldiers will change the outcome of the war. 
(Source: Sunrise)

The first episode, Aoi Hitomi no Casval, tells the story of Casval Rem Deikun and Artesia Som Deikun (Char and Sayla, before Char became known as the Red Comet) before the One-Year War in UC.0068. 
 
The story for the second episode, Kanashimi no Artesia, moves three years ahead to U.C. 0071. The story will follow the tearful separation of the siblings Casval and Artesia (before they became known as Char and Sayla). It will also feature more of the development of the mobile suits, particularly on the Zeon side. 
 
The third episode, Akatsuki no Houki, follows the youth who would become known as Char Aznable and his future comrade Garma Zabi after they join the Zeons' military academy.
 
(Source: Anime News Network)

As Celestial Being begins their anti-war activities, Fereshte begins to move in with the group being led by Chall Acustica, an ex-veteran of Celestial Being who had ended her service as a Gundam Meister after getting scarred in an unknown accident. Under her wing is Fon Spaak, an 18-year old career criminal forced into Fereshte's service by using the GNY-004 Gundam Plutone as part of his "services" as a Meister pilot.

It is time for the "Gundam Fight" tournament! Each country sends a Gundam to Earth for this prestigious tournament in the hopes of winning power and glory for their homeland! But this time, there's an unseen evil lurking behind the scene. Domon Kasshu, Neo Japan's reluctant Fighter, is determined to uncover this evil and clear his family name! The fight to the top begins now! 
 
(Source: Nozomi Entertainment)

Whereas the main story of Mobile Suit Gundam SEED focuses on the struggles between the Earth Alliance, ZAFT, and Orb Union, the Astray series is focused on the three MBF-P0x mobile suit prototypes (however mainly on Lowe Guele) and their respective pilots and organizations, who mainly exist on the outskirts of the main SEED storyline. The MBF-P02 Astray Red Frame is piloted by Lowe Guele of the Junk Guild, and the MBF-P03 Astray Blue Frame is piloted by Gai Murakumo of the mercenary group Serpent Tail. The third Astray, MBF-P01 Astray Gold Frame, is piloted by the primary antagonist of the Astray story, Orb nobleman Rondo Ghina Sahaku, and later by his twin sister Rondo Mina Sahaku.

It is the year A.D. 2307. Fossil fuels on Earth have been depleted entirely, with mankind turning to the next available power source: solar energy. During this time, 3 orbital elevators with solar power generation systems are built, each under control by the Union (formerly United States of America), the Human Reformist Alliance (Russia, China and India) and the AEU (Europe). However, not all countries are able to enjoy the benefits of this system, leading to widespread resentment and war. Arising out of the conflict, a mysterious non-profit military organization known as Celestial Being appears, dedicated to end all warfare using Mobile Suits called Gundam. This begins the stories of Gundam Meisters (pilots) Setsuna F. Seiei, Lockon Stratos, Allelujah Haptism and Tieria Erde as they are thrown into conflict between the 3 superpowers and the other various factions.
 
(Source: Anime News Network)

When one space colony declared its independence from the Earth Federation, the devastating 7th Space War, an all-out war between Earth and space, resulted. The Federation responded to the Space Revolutionary Army with mobile suits, called Gundams. However, the Space Revolutionary forces played their trump card and dropped hundreds of space colonies onto the Earth, plunging the planet into a seven-year-long nuclear winter. The Federation collapsed, but the Space Revolutionary Army was unable to invade the Earth in the aftermath of the colony drop. Fifteen years have passed. The year is now After War 0015, and a New Federation has sprung up on Earth to restore order. In space, the colonial leaders have been rebuilding their own forces as well. By chance, fifteen-year-old Garrod Ran has discovered an old Federation mobile suit, the Gundam X, and now he uses it to help out the Vulture ship Freeden in its struggle to keep the powers that be from repeating the mistakes of the past. 

Mankind has moved into space. Thousands of people live on giant orbiting space colonies called "Sides." However, the Earth Government, which rules the colonies, is unjust and cruel. A group of revolutionaries build five robotic weapons called Gundams and plan to send them to Earth to begin their fight for independence. Piloted by five young men, these Gundams carry the colonists' hopes and dreams of freedom with them as they descend to Earth to begin Operation Meteor! 
 
(Source: Nozomi Entertainment)

Some time after the events of Gundam EXA, Sthesia Awar informs Leos Alloy that she discovered a new GA data cluster from a computer outside of Jupiter X. The two dive into the new data and find themselves in the Universal Century, during the attack on Side 7. However, after entering the colony, they find that the inside was in ruins, and the RX-78-02 Gundam has been destroyed before it could be activated by Amuro Ray.
The two discover a faint life sign in the colony, the source of which is Themis Chiron, a G-Diver from Saturn II. Chiron warns the two to get away as soon as possible, or they would be caught in the conquest of Mars I.

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