Starsky, Hutch, and two other Officers respond to an armed robbery on a jewellers, only for a woman to accidentally get shot dead from the gun-fire from one of the lawmen. The dead woman's husband is a Special Agent, paranoid after being retired from the service, and convinced that the Officers were really hit-men after him, and sets about extracting his revenge on each of the Cops involved in the death of his wife.
With the man an expert in specialist weapons, Starsky and Hutch must stop the deranged Agent before he uses his expertise training to wipe them out...