Fate deals a cruel blow to retired detective Jim McClain (James Arness) when his partner and close friend Sid Lammon (Gerald S. O'Loughlin) is brutally murdered. McClain is not only shocked by the senseless killing but frustrated by what he views as the plodding investigative methods of the modern police force. Openly clashing with detectives Harry Gates (Marshall Colt), Jerry Cross (Carl Franklin) and their chief, Edward DeNisco (George DiCenzo), McClain decides the only way to beat `em is to join `em. Earning the right to carry a badge again, McClain brings his street-smart, street-tough maverick style of police work, causing chaos in the squad room until his fellow officers see that this old-school rogue is ready to work within the new rules. Notable series guests include Markie Post (Night Court), Michael O'Hare (Babylon 5), Joe Pantoliano (The Sopranos) and Richard Jaeckel (Spenser for Hire).