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Please note that this is the Gundam Wiki's article on the final episode of the first season of Mobile Suit Gundam 00; if you are looking for the article on the main protagonist of Mobile Suit Gundam 00 then you should head to Setsuna F. Seiei.

Setsuna (刹那 Setsuna?) is the 25th episode and the season finale to the first season of Mobile Suit Gundam 00.

Plot

Setsuna in his Gundam Exia attacks the Alvatore but is forced back by a number of beam shots. Lasse suggests hitting the remaining parts of the Assault Container in the mobile armor's arms to take out the said arms. The two simultaneously shoot the pieces, but it deals no damage to Alvatore.

On board the Assault Container, Feldt Grace reports on the current status of the Gundams; Gundam Nadleeh is disabled, Gundam Kyrios is severely damaged and Exia and the GN Arms Type-E is in combat with Alvatore. Sergei Smirnov and Soma Peries begin their search for Kyrios. Inside its cockpit, Allelujah Haptism tell his other self, Hallelujah, that he "hasn't heard the world's call yet." Hallelujah agrees, takes off the helmet and pulls back their hair, planning on showing Soma "what a true Super Soldier" is made of. Kyrios then launches it attack. Through use of precise thinking, Allelujah is able to strike both his opponents simultaneously, taking out Sergei's GN-X's left arm. He then avoids all shots at him.

Alejandro Corner unleashes six remote controlled Fangs from the Alvatore at the Exia and the GN Arms Type-E, managing to destroy the Gundam's shield, so Setsuna docks with Lasse Aeon's GN Arms Type-E to form the GN Armor Type-E. They take out the Fangs and an intense battle with the Alvatore ensued. Lasse is eventually knocked out by an explosion in his cockpit caused by the Alvatore's attack, but Setsuna continues the fight and managed to cripple the mobile armor. As the GN Arms Type-E component of the GN Armor Type-E explodes from the accumulated damage, Setsuna and his Exia ejects and proceed to cause massive damage to the Alvatore, finally defeating the mobile armor.

Kyrios takes out Sergei's other arm and then surprises Soma. In a beam saber fight, Soma wonders out loud why Allelujah is able to outclass her, claiming to be the perfect Super Soldier. Hallelujah yells through the comm that reflexes combined with intelligence are what make the true Super Soldier and activates Trans Am and is about to kill her when Sergei takes the blow, allowing Soma to severely damage Kyrios. She then tends to the Colonel, not wanting to be alone anymore.

Setsuna tries to reach Lasse but a beam shot comes from Alvatore's direction. It is revealed that a golden winged mobile suit, Alvaaron, was controlling the mobile armor. Alejandro Corner comments that he was outclassed by a machine equipped with the original GN Drive. He reveals to Setsuna that he intends to guide the world in a new age, one that Celestial Being won't be in. After exchanging several attacks with the Exia, Alejandro fires the Alvaaron's powerful beam cannon at the Gundam. He then assumes his enemy is destroyed, but Setsuna is able to avoid the attack with Trans Am. Getting the epiphany that he has finally found the world's distortion, he attacks the Alvaaron but its GN Field stands in the way.

Flashing back to two years ago, Lockon Stratos explains to Setsuna as to why Exia is equipped with a physical sword: it's for counteracting GN Fields; within their plan, they also have anti-Gundam measures, so Setsuna is their trump card. In the present, he strikes the Alvaaron with Exia's swords. Using the Gundam's seven swords, Setsuna defeats Alejandro and his Alvaaron. Ribbons Almark then contacts a bloodied Alejandro, revealing that he intends to guide the world in his place. He was only observing as to how far Alejandro could go with his schemes. Furious that Ribbons is usurping his family's long-laid out plans, Alejandro punches the screen, just as the Alvaaron explodes.

Setsuna believes it is over, but is faced with the GN Flag, piloted by Graham Aker. He is extremely surprised to see the kid he met in Azadistan. The two begin a sword-saber fight, arguing about points-of-views of the world. Aker was just looking for his opportunity to avenge Howard and Daryl. The two mobile suits are heavily damaged and seemingly destroyed each other in an explosion of GN Particles.

Marina Ismail soon receives an e-mail from Setsuna, asking why the world is so distorted. He promises that he will continue to fight for a new world with his Gundam. But by the time she reads his message, he'll be gone. Exia is last seen above Earth's orbit.

Four years later, Saji Crossroad sends a message to Louise Halevy and states he has achieved his dream of becoming a space engineer. Busy working on an Union space colony, he finishes delivering some parts before gazing at the Earth. He and his colleagues spots a stream of GN Particles. The colleague questions which nation it belongs to, Saji replies that the unit was not from the United Nations, the color was different. "That light is a Gundam"

With the temporary disappearance of Celestial Being, the nations of the 328 countries, had merged. The Earth Sphere Federation was announcing at its 1st anniversary the dissolution of each nations' previous army and forming "one Federation peacekeeping army". The dream of a united world seems to have been achieved.

Ribbons has formed a team, Innovators, compromising of 5 other members, situated inside the moon base where Veda resides. He comments that it is time for them to change the world

Elsewhere, Graham survived his encounter with Setsuna but his face is covered by a mask. Watching the Federation's press conference, Ali al-Saachez puts his drink down. Louise is seen riding an elevator with a man that looks similar to Tieria

At one of CB's resource satellites, Wang Liu Mei, Hong Long, and Nena Trinity arrived to inspect the new Gundam units on board the Trinity Mothership. Nena asks Wang if she likes the world as it is, and she replies that she has expectations that the world will change. Wang Liu Mei requests to view the very first Gundam to equip the GN Drive, the 0 Gundam. Ian Vashti complies and explains that its GN Drive was removed and installed in a new unit. Seeing the container that contains the new unit, the 00 Gundam, Wang comments that it could change the world.

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