S1·E17 The Edge of the World

At the ruins of the legendary Atlantis, Hitomi, Van, and Allen encounter various figures in their past, including Hitomi's grandmother, Van's mother, Balgus, and Allen's sister and father. Hitomi also watches the history of Atlantis from the creation of the thought-realizing Atlantis Machine through the genesis of Gaea to Atlantis's eventual destruction.