In 1996 Brooklyn, Molly Wright witnesses her parents being neuralysed by agents of Men in Black while she helps an alien escape, avoiding neuralysation herself. Twenty-three years later, rejected from government agencies due to her "delusions" regarding alien life, Molly tracks down an alien landing and follows MIB agents to their headquarters in New York City. Caught entering the agency, Molly makes an impression on Agent O, arguing that her obsessive search for them makes her 'perfect' for the job and has no life outside her search for the agency. She is awarded probationary agent status as "Agent M" and assigned to the organization's London branch. Now she joins J and K to fight a new alien organization called the Hive.