McGarrett is badly wounded by an escaping attacker at home after several former SEAL mates were recently killed in their homes. He leaves the team research in Hawaii and travels alone, even without junior, to retired Joe White's ranch in Montana, where they also receive Tim Cole, the last other survivor -besides uncooperative jailed CIA traitor Greer- of their SEAL team which was to kill jihadist terrorist leader Hassan but spared his then 10-year-old son Omar, now a vindictive businessman. The rest of the Five-0 looks into the person who is trying to seek revenge. When the SEAL trio stand a gun battle against a dozen assassins, those and Joe get shot and he later dies from hopeless liver injuries, near his dream tree.
—KGF Vissers