

On assignment to protect the daughter of a crime czar who's agreed to testify against mob bosses Starsky and Hutch must drive her back home from San Francisco pursued by ruthless killers all along the way
An elderly couple, desperate to draw attention to the poor living conditions in their old folk’s home, have rigged the trunk of their car with fifty sticks of dynamite and a timer, planning to set it off outside City Hall. But the car is stolen by two thugs on a spree of armed liquor store robberies, unaware that the car is loaded with explosives, ticking towards detonation in the trunk.
Wealthy used-car dealer Zack Tyler and his wife stop to help two men seemingly having car trouble, only for the two thugs to rob Zack, and rape and murder his wife. Starsky and Hutch work all out using their underground contacts to track down the two murderers, but they don't quite realise that once they have found the culprits, that Zack intends to get even with his wife's killers by taking the law into his own hands.