An Irish terrorist (Stephen Boyd) poses as a priest in order to buy bombs and weapons in Hawaii for use in his home country.
McGarrett teams with a Navy commander (Mark Lenard) to search for a cargo ship hijacked by armed and dangerous men.
Rookie cop Joey Kalima (John Rubinstein) is framed for departmental corruption by a group attempting to rob a bank.
A congressman (David Birney) cheats on his wife while judging a beauty contest, and is blackmailed by a dangerous man (Soon-Tek Oh).
Five-O is summoned after a mystery writer (Mildred Natwick) investigates a fraudulent, and murderous, cryogenics outfit.