A calculating criminal bumps off a loan-shark's collector and takes over the role, collecting debts for the head of the money-loaning racket – a washed-up former child star. The Detective pals investigate, only for it to turn out that the father of Hutch's girl-friend is one of the people owing money to the crooked racket, and that the vicious new collector is actually a notorious killer with an ulterior motive...

The intrepid Detectives investigate a woman's claims that a jealous brief acquaintance from San Francisco has followed her to the city and is responsible for the vicious murders of a string of the her lovers. But there is a sinister twist to the case, and Starsky unknowingly places himself in great danger...

When a leading model – an old flame of Hutch's – is told that she is terminally ill with Cancer, she arranges for a hit-man to end her life before the disease can take it's toll on her body. Then her doctors discover that she is in remission – but her contact with the genius hit-man has been severed, and she must go to old friend Hutch for help to prevent the hit from taking place...

A former partner of Hutch's arranges the murder of a witness in order to pay off his wife's gambling debts.

When a contract is put out to kill a top union official, Starsky and Hutch go undercover as hit men to protect him. But while Hutch rehearses his performance as a trigger man, Starsky is plagued by a young admirer who may compromise his cover.

Competing for the affections of a policewoman, Starsky and Hutch neglect their investigation of the murder of a dance-hall girl.