Yu-Gi-Oh! GX

Darkness Invasion, The Stolen Memories (4x17)

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Trueman has possessed Sorano's body and has been assaulting students in the academy one by one. The students he defeats get dragged into Nothingness and memories of them get wiped clean from the populous. Chazz and the others also fall to Trueman, and Atticus, having forgot about them, meanders around the barren academy by himself. Jaden and Jesse manage to reach him, and then the real mastermind behind Trueman finally shows up...