Heat is a 1995 American crime drama film written and directed by Michael Mann. It features an ensemble cast led by Al Pacino and Robert De Niro, with Tom Sizemore, Jon Voight, and Val Kilmer in supporting roles. The film follows the conflict between a Los Angeles Police Department detective, played by Pacino, and a career thief, played by De Niro, while also depicting its effect on their professional relationships and personal lives.