Serleena is a fictional character from the movie Men in Black II, released in 2002. She is portrayed by actress Lara Flynn Boyle and serves as the main antagonist. Serleena is a shapeshifting alien who takes on the form of a beautiful woman but has a sinister agenda to conquer Earth. In the film, Serleena seeks to obtain a powerful artifact known as the Light of Zartha. Her character is known for her cunning intelligence and ruthless nature, making her a formidable foe for the agents of the Men in Black, particularly Agent J and Agent K.