Island of the Gods (S01E19)
Following the mysterious arrival of Avalon, Lelouch, Euphemia, Kallen, and Suzaku find themselves stranded on Kaminejima. Suzaku stumbles upon Kallen, while Euphemia encounters Zero. During their conversation, Suzaku reveals to Kallen that he killed his father, and she shares her identity as a Black Knight and the pilot of the Guren Mk-II. Euphemia realizes that Lelouch is, in fact, Zero. Meanwhile, Schneizel, Lloyd, and Cécile Croomy investigate the island's ancient ruins. When Lelouch, Kallen, Suzaku, and Euphemia inadvertently fall into the ruins, they seize the prototype Knightmare Frame Gawain to escape. In a separate development, the exiled Japanese government from seven years earlier launches a major offensive on Kyūshū, aided by the Chinese Federation.