Nightmare Fuel / YU-GI-OH GX: Sleeping Beauty

• The prologue. In it, Yubel lays waste to two kingdoms in order to capture Prince Judai and murder Princess Alexandra
• The summoning ritual which brings Yubel to Earth
• Yubel's interruption of the presentation ceremony
• Jaden's abduction
• Yubel hypnotising Alexis and luring her to a hidden room to fulfill the terms of the curse
• Chazz cornering Alexis in her own home, without her friends or guardians noticing
• The transformation processes from Yubel to Terror Incarnate and then into Ultimate Nightmare
• In the course of the climax, all of the monsters Jaden summons to help him fight Yubel are subjected to a terribly violent destruction
• Oh, let's just face it. Yubel is pretty much the driving force of Nightmare Fuel in the entire story.