Hey Arnold!

Ghost Bride (5x34)

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In his urban legend, he tells the story of the ghost bride, and how she murdered her husband after he left her for her sister. Turns out she's buried in the cemetery near the gang's neighborhood. She comes back from the dead every anniversary of the murders. Arnold, Gerald, Eugene, Harold, and Stinky are scared twice by Helga and Curly, by them pretending to be the ghost of Cynthia Snell, the Ghost Bride.