R1
25 listed episodes · First aired October 5, 2006

Season overview
After the Holy Empire of Britannia conquers Japan and renames it Area 11, a Britannian student named Lelouch Lamperouge gains the "Power of Kings" called Geass from a girl named C.C. Lelouch uses his newfound power to become Zero, a masked vigilante leading a rebellion against Britannia to seek revenge.
Episodes
On August 10, 2010, a.t.b., Japan was conquered by the Holy Empire of Britannia. Seven years later, teenage student Lelouch Lamperouge finds himself pulled into a battle between anti-government terrorists and the Britan…
E2The White Knight AwakensUsing his newfound power, Lelouch hijacks an enemy Sutherland and leads the rebels in a counterattack against the Britannian army, forcing Viceroy Clovis la Britannia to call for the release of an experimental Knightmar…
E3The False ClassmateLelouch confronts Clovis about the murder of his mother, Marianne vi Britannia, before killing him. When he returns to Ashford Academy, he discovers that Kallen Kōzuki, one of the terrorists he helped in Shinjuku, atten…
E4His Name is ZeroThe Purist faction within the Britannian Army scapegoats Suzaku for Clovis' death, planning to use him as an excuse to rid the army of Honorary Britannians. Lelouch concocts a plan to save his childhood friend, with som…
E5The Princess and the WitchTo Lelouch's surprise, C.C., the girl who gave him his power, is alive and now living in his residence. Suzaku, having been acquitted of all charges, accidentally meets Third Princess Euphemia li Britannia and ends up i…
E6The Stolen MaskSuzaku transfers into Ashford Academy and faces the scorn of the Britannian students. Cornelia continues her hunt for Zero, destroying several rebel strongholds but finding no clues to his whereabouts. A stray cat slips…
E7Attack CorneliaCornelia sets a trap for Zero at the Saitama Ghetto as she begins to clear another resistance cell. Despite C.C. trying to stop him, Lelouch takes the bait and goes to the aid of the Saitama resistance. His plan falls a…
E8The Black KnightsA group from the Japan Liberation Front takes a hotel and its occupants hostage, including most of the Ashford Student council and a disguised Princess Euphemia. As such, Princess Cornelia cannot make a move against the…
E9RefrainTold mostly from Kallen's perspective, her rocky relationship with her biological mother is revealed. The Black Knights are sent on a mission to take out the drug "Refrain", and find themselves to be popular among the E…
E10Guren DancesCornelia and the Britannian Army heads to Narita, hoping to destroy the remnants of the Japan Liberation Front. Lelouch has his Knights follow her in the hope of capturing her alive so he can question her about his moth…
E11Battle for NaritaThe Black Knights' assault on the Britannian Army in Narita proves successful, and Cornelia is cornered by Kallen and Lelouch. The army is pinned down by the Japan Liberation Front when they attempt to assist her. At Eu…
E12The Messenger from KyotoZero and the core members of the Black Knights meet with Taizō Kirihara, one of the most powerful people in the Japanese underground and an acquaintance of Lelouch from his younger days at the Kururugi Shrine. Lelouch d…
E13Shirley at GunpointKallen and Lelouch separately reflect upon the deaths of innocents in the Narita campaign. Shirley secretly follows Lelouch and witnesses the battle between the Japan Liberation Front and the Britannian Army, which Lelo…
E14Geass vs. GeassLelouch believes Shirley may have discovered his identity as Zero, so he and C.C. pursue her to Narita. Ohgi explores the battlefield of the previous night, discovering the wounded Villetta Nu left for dead out of sight…
E15Cheering MaoC.C. explains her history with Mao, and how his inability to turn his Geass off drove him insane. An injured Villetta wakes up in Ohgi's apartment and he discovers she has selective amnesia. C.C. leaves Lelouch to take …
E16Nunnally Held HostageC.C. departs as a messenger to the Chinese Federation and Milly has a marriage interview with Lloyd Asplund, creator of the Lancelot. Mao returns to kidnap Lelouch's sister, Nunnally, and holds her hostage in the Ashfor…
E17KnightAn inauguration ceremony of Clovis' memorial art museum is being held, with Euphemia judging the art works. Lelouch agrees to help Kyoshiro Tohdoh's comrades rescue their leader and Shirley finds an old crumpled letter …
E18I Order you, Suzaku KururugiAs Euphemia knights Suzaku, Lelouch establishes the hierarchy of the Black Knights. Diethard Reid suggests assassinating Suzaku, but Lelouch has other plans for him. He launches a plan to disable and capture Suzaku and …
E19Island of the GodsThe aftermath of the Avalon's arrival inexplicably leaves Lelouch, Euphemia, Kallen, and Suzaku on the island of Kaminejima. Suzaku encounters Kallen while Euphemia is found by Zero. Suzaku learns Kallen is a Black Knig…
E20Battle for KyushuThe Britannian Army fights back against the Kyūshū invaders with the Lancelot. Meanwhile, Nina meets Princess Euphemia and inadvertently gives Euphemia peace of mind about her feelings for Suzaku. As Suzaku becomes corn…
E21The School Festival DeclarationThe Ashford Academy holds their annual school festival. Ohgi, Villeta, Euphemia, and Kallen all make their separate ways to the event. A series of close encounters risks the revealing of hidden identities, but all those…
E22Bloodstained EuphyDuring the commemoration ceremony for the Specially Administrated Zone, Lelouch and Euphemia privately discuss Japan's future. She convinces him, and Lelouch summarily halts his rebellion, until he suddenly loses contro…
E23At Least with SorrowLeft with no choice, Lelouch shoots and mortally wounds Euphemia in front of Suzaku. Suzaku returns to the Avalon with her battered body as the Black Knights continue to contain the violence. She succumbs to her injurie…
E24The Collapsing StageLelouch's strategies give the Black Knights and their allies the upper hand in their battle against the Britannian Army. As riots break out through the country, the Black Knights take over the Ashford Academy as their h…
E25ZeroAfter managing to capture Cornelia, Lelouch forces her to reveal what little information she knows of Marianne's murder, but the answers do not please him one bit. V.V. takes Nunnally to Kaminejima, and Lelouch abandons…