Boris the Animal is a fictional character from the movie series Men in Black. He is portrayed as a dangerous and vengeful alien with a distinctive appearance, including a missing arm and a menacing demeanor. Boris seeks revenge against Agent K, a key character in the series, for imprisoning him on a distant planet. In Men in Black 3, Boris travels back in time to alter history and eliminate Agent K. His character is known for his cunning intelligence and ruthless tactics, making him a formidable antagonist in the film. Boris's unique design and personality contribute to the film's blend of science fiction and comedy.