*Spoiler Alert* if you have not seen the movie From an AI source: Colonel Steven J. Lockjaw is the main antagonist of the 2025 film One Battle After Another, portrayed by Sean Penn. He is a corrupt U.S. military officer tasked with deporting undocumented migrants, who becomes obsessed with a revolutionary named Perfidia Beverly Hills and later attempts to join a white supremacist secret society called the Christmas Adventurers Club. Lockjaw's character is defined by his hypocrisy and insecurity; despite his racist ideology, he fathered a child with Perfidia and desperately seeks validation from the very group that despises his interracial relationship. His performance is noted for its physicality, including a stilted, robotic walk and a distinctive haircut, culminating in a third-act disfigurement from injuries sustained during his pursuit of the film's protagonists. Role: Main villain and corrupt military colonel. Actor: Sean Penn. Key Traits: Racist, manipulative, obsessed with status, and physically imposing yet internally pathetic. Fate: He is inducted into the Christmas Adventurers Club under false pretenses, only to be fatally gassed and cremated by the club leaders to protect their institutional reputation.