Léon, the top hit man in New York, has earned a rep as an effective "cleaner". But when his next-door neighbors are wiped out by a loose-cannon DEA agent, he becomes the unwilling custodian of 12-year-old Mathilda. Before long, Mathilda's thoughts turn to revenge, and she considers following in Léon's footsteps.

Pivoting on the unusual relationship between seasoned hitman and his 12-year-old apprentice -- a breakout turn by young Natalie Portman -- Luc Besson's Léon is a stylish and oddly affecting thriller.

'Leon: The Professional' is acclaimed for its exploration of themes like friendship, redemption, and loyalty, alongside strong performances by Jean Reno, Natalie Portman, and Gary Oldman. The film's stylish direction, cinematography, and emotional depth are widely appreciated. However, it faces criticism for unrealistic plot points, particularly the relationship between Leon and Mathilda, and the portrayal of corrupt law enforcement. Some find the action sequences uninspired and the humor ineffective, though many still value its artistic and emotional impact.