During a Hazardous Materials (Haz-Mat.) Incident, such as a chemical spill or leak, the Chicago Fire Department assigned three specific levels of response depending on the size and magnitude of the incident. Aside from standard fire suppression equipment and Haz-Mat. equipment, the CFD also can dispatch standard fire suppression equipment whose crews have special training in hazardous materials situations and mitigation. These companies are called the Hazardous Incident Team (H.I.T.). The Chicago Fire Department cooperated with film director Ron Howard on making the 1991 film "Backdraft", starring Kurt Russell, William Baldwin, and Robert De Niro. The NBC television show "Chicago Fire", centers on a group of fictional firefighters and paramedics at a firehouse that is the headquarters of the fictitious Engine Company 51, Truck Company 81, Rescue Squad Company 3, Battalion Chief 25 and Ambulance 61.(represented by the headquarters for real Engine Company 18). CFD firefighters were involved in the production as consultants or extras and real places in the city were often referenced in the characters' dialogue. The series premiered in 2012. There are different themes for each episode.