Agent Q

Agent Q was an MIB agent mentioned in the Men in Black: Animated Series.

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According to Agent K, Agent Q was an MIB agent who died after he attended an "all you can eat" alien smorgasbord buffet in 1987. It was implied the alien food disagreed with his human biology and killed him shortly afterwards. He was never replaced after his death to the point Agent J remarked there was no Agent Q on staff in the modern day.