Police detective Joe Bromowski (Sylvester Stallone) has just broken off his relationship with his girlfriend (and fellow police officer) Gwen Harper (JoBeth Williams), so Joe's mother Tutti (Estelle Getty) decides it's time to pay him a visit. Tutti proceeds to make Joe's life miserable by nagging him about his clothes, cleaning his apartment, washing his gun, tagging along on investigations, and somehow getting involved with a gun-running organization that the police have been trying to infiltrate.