Hawaii Five-O (1968)

S1E13 Deathwatch

In "Deathwatch," McGarrett is tasked with safeguarding a mob underboss, who is set to testify against his boss, Joe Matsukino. As the stakes rise, it becomes clear that Matsukino is determined to eliminate any threats to his empire, employing devious methods to ensure his former associate remains silent for good. McGarrett must navigate a web of danger to keep the witness safe and bring Matsukino to justice.