Mobile Suit Gundam 00

Celestial Being, a private army dedicated to eradicating war, begins demonstrating the powers of their new "MS-GUNDAM" suits by interrupting the public demonstration of AEU's latest Mobile Suit, the AEU Enact and by protecting the Human Reform League's Space Elevator, "Tenchu" from being attacked by terrorists when their mobile suits had attempted to launch rockets on the "Tenchu", earning a news appearance from various TV news channels where Celestial Being's goals were publicly stated by Aeoria Schenberg.

The world bodies discusses the possible origins and impact of Celestial Being. The Gundams made their first combat appearance in Ceylon, formerly called Sri Lanka where Lockon leads the Gundams in taking on the Human Reform League and rebel Sri Lankan forces. Meanwhile, JNN reporter Kinue Crossroad discovers something about Aeoria Schenberg's origins. The episode ends with Graham Aker ambushing Setsuna to sate his curiosity about the Gundams.

Setsuna dispatches Graham with ease, the latter being caught off guard by the advanced technology of the Gundams. Tieria returns to space with Gundam Virtue. The Union Army creates the Anti-Gundam Investigative Squad with Graham and Billy transferred from the MSWAD as official members. Meanwhile, Celestial Being launches surprise attacks in South Africa, the South American continent over Taribian airspace, formerly in Venezuela and Guyana, and in Ceylon. Setsuna later faces off against Colonel Smirnov while conducting an attack against Human Reform League mobile suits. Later on, a JNN broadcast revealed that various militant factions in North Ireland signed a peace treaty, ending years of fighting between themselves, the British Army and the PSNI.

Colonel Sergei returns to the Reform League to head a new squad designated for capturing one of the Gundams, with Soma Peries as his designated subordinate. Encouraged by Celestial Being's anti-conflict actions, the South American nation of Taribia declares its withdrawal from the Union and declares it independence over the control of energy resources, prompting a Union military response, forcing Celestial Being to intervene. In Azadistan (In the territory of Iran), Shirin Bakhtiar explains to First Princess Marina Ismail that the conflict is not as simple as it may first seem. Meanwhile, the Anti-Gundam Investigative Squad, in Flag Customs, engage Exia in Taribian airspace. Later on, pro-Taribian separatist politicians led by its prime minister are forced to drop their bid for independence after their forces were defeated by the Gundam Meisters.

Colonel Sergei conducts tests on a new Mobile Suit built especially for Soma Peries, a bioengineered human. Allelujah Haptism and Soma Peries experience a strange connection brought on by their proximity to each other. This causes Soma Peries to go into a fit of rage who begins to fire shots randomly at the space elevator severing a section containing civilians. Meanwhile on board the elevator Allelujah Haptism experiences another side of himself but regains his composure and runs off. Colonel Sergei attempts to help the civilians before they drift past the Breakaway Limit Zone and into the Earth's atmosphere but his mobile suit is ill-equipped. Allelujah Haptism, piloting the Gundam Kyrios, arrives to aid the Colonel.They save the civilians but at the cost of revealing Dynames' GN Sniper Rifle Extreme Long Range Custom.

The Republic of Moralia, located in the southeast of France (what today is the Principality of Monaco) and a member of the AEU, has placed in armed forces in joint exercise with French-led AEU forces, including Patrick Colasour. Marina heads to France to request humanitarian assistance, despite the incomplete status of the AEU's Orbital Elevator. Meanwhile, Celestial Being Gundam Meisters were led by Sumeragi Noriega and her crew (except Lichtendahl Caeli and Lasse Aion) alongside Wang Liu Mei in disrupting the exercises, taking on both Moralian and AEU mobile suits. Later on, Setsuna is surprised when he takes on Ali Al-Saachez, a figure from his past, in his custom-made AEU Enact prototype.

The Gundam Meisters were able to defeat the Moralian Army, despite an earlier attempt by Setsuna to confirm if Ali was in the AEU Enact prototype that he fought with. Their actions had formed the Moralian Armed Forces to surrender to the Meisters after the previous State of emergency was declared. While Setsuna was being reprimanded by Lockon and Tieria for placing all of Celestial Being in danger for the potential of having their real identities exposed, an unknown terrorist group had conducted simultaneous bombings in various nations as a warning message to take on Celestial Being with more indiscriminate bombings unless the group disbands.

The Gundam Meisters are being sent off to investigate the terrorists responsible for the indiscriminate bombings in the Union, HRL and AEU. In Scotland, Setsuna attempts to capture one of the bombers, but was nearly apprehended by a Scottish Authorised Firearms Officer after firing his pistol if not for Marina's intervention. In that encounter, Setsuna reveals himself as a Gundam Meister to Marina and his hatred to Azadistan for waging war on the Kurdish Republic with Marina taking it as a funny joke. The Meisters launched attacks against La Eden, revealed to a European-based conservative party group, in South America and in the Marshall Islands with Setsuna nearly taken out by a mobile armor after attacking a La Eden cargo ship based on information leaked out in the internet network by France's DGSE, Germany's BND and the United State's NRO. Meanwhile, Marina heads out to Finland as part of her journey to seek humanitarian aid for Azadistan when she encounters the Exia flying close to her plane.

It has been four months since Celestial Being's first intervention and the Gundam Meisters have been involved in over sixty intervention operations. As the world begins to change around them, the crew aboard the Ptolemy and the Gundam Meisters have some time to themselves. Lockon and Felt's relationship is further explored which reveals that Celestial Being and the Gundam Meisters have a far older history than it was originally thought. In Azadistan, a United Nations delegation was led by Alejandro Corner, who was using his UN envoy status to meet with Marina and other Azadistani officials. The HRL releases a web of comm detection devices to find the Gundams in space, catching the crew of the Ptolemy off guard. Ill-prepared for this attack, the Gundams and the crew of the Ptolemy launch an offensive. Sumeragi Lee Noriega goes up against Colonel Sergei Smirnov accompanied by Soma Peries in her Tieren Taozi and a battle ensues around the Solar Satellites System.