Kidou Senshi Gundam 00

Synopsis

Three new mobile suits, piloted by Trinity siblings Johann, Michael, and Nena, appear on the battlefield and reveal themselves as the Gundam Throne Eins, Zwei, and Drei. Caught off-guard by the new Gundams' arrival, the Project G units are forced to retreat. To secure an escape route, Gundam Throne Drei covers the entire region in GN particles, causing havoc with enemy communications and preventing a counterattack. After escaping from the Taklamakan, the rescued Gundam Meisters are anxious about the new units and disturbed about not knowing of their existence. While world leaders despair at the appearance of the new Gundams, Alejandro Corner attends an anonymous conference with the other Celestial Being "observers" to review their activities and to discuss the acknowledgement of the Thrones. Aboard their spaceship, the Trinity siblings meet the Ptolemaios and the Gundam Meisters.

(Source: Wikipedia)