A crime-solving computer indicates that it was one of McGarrett's people responsible for the murder of a mob figure.
McGarrett suspects a wealthy race car driver's (Ricardo Montalban) fiancee (Diana Muldaur) killed two mechanics.
The deaths of wealthy businessmen lead the team to a lucrative blackmail operation; guest William Shatner.
Danny is involved in the shooting of a teenager following a fellow police officer's death; guests John Rubinstein, Louise Latham.
McGarrett suspects criminal genius Wo Fat when a secret missile is stolen and offered to the highest bidder; guest Soon-Teck Oh.
An Army officer (Clu Gulager) plots to hold a scientist for a ransom of $1 million in diamonds; guest Michael Conrad.
Jack Lord
Det. Steve McGarrett
James MacArthur
Danny Williams
Kam Fong
Chin Ho
Al Harrington
Actor
Herman Wedemeyer