McGarrett is arrested while investigating the death of a former SEAL friend. Adam returns to Oahu with news about his marriage.
A full-fledged strike ensues when a group of Cloud 9 employees walk off the job to protest the firing of Glenn; Jonah tries to help Amy negotiate with corporate; Garrett meets a gorgeous woman on the picket line.
Taco discovers a new strain of marijuana, while Andre attempts to control Pete's relationship with one of his patients. Meanwhile, Trixie Von Stein's return causes problems for Russell and Andre's already strained relationship.
Queen Helena meets a new rival; King Cyrus gets some bad news.
King Cyrus attempts to eliminate King Simon's legacy; Princess Eleanor makes a friend.