Heat is a 1995 American crime film written and directed by Michael Mann. It features an ensemble cast led by Al Pacino and Robert De Niro, with Val Kilmer, Tom Sizemore, Diane Venora, Amy Brenneman, Ashley Judd, Wes Studi, and Jon Voight in supporting roles. The film follows the conflict between an LAPD detective (played by Pacino) and a career criminal (played by De Niro) while also depicting its effect on their professional relationships and personal lives.