The crew of the Enterprise discovers that Starfleet is in ruins after they are summoned home, and they venture into a war zone to find the powerful villain responsible for the devastation.
Barry prepares for a mission even though his forces have been depleted. Meanwhile, Leila loses confidence in Jamal's ability to keep the family safe when hostilities reach the palace.
A mysterious man targets select police officers and it's learned that McGarrett is next on his hit list.
Serbian terrorists take over the U.S. embassy in Bucharest and threaten to kill hostages if their imprisoned leader is not set free. A military general is sent to prevent deaths and a potential nuclear conflict.
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