A 23-year-old man suffered facial injuries when a man dressed as Superman assaulted him during a dispute over a shortage of food at a burger van.
The assailant was with two other men, one dressed as Batman and the other also wearing a Superman outfit.
The incident happened when the victim was walking along Station Road East, Canterbury, at around 12.30am on Christmas Day, Kent Police said.
Officers are appealing for anyone with information to come forward.
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