The first season concludes with criminal mastermind Wo Fat trying to destroy Five-0, after McGarrett obtains some incriminating information about the crime lord’s organization.
Five-0 confronts a bioterrorism threat after Danny is exposed to a lethal chemical agent.
A famous fashion photographer (Rick Springfield) who is in Hawaii to shoot a sports magazine’s annual swimsuit edition is murdered
A science-fiction fan dressed as a superhero is murdered; McGarrett receives a visit from a CIA agent interested in finding Yakuza.
The man who murdered McGarret’s father resurfaces; Chin Ho’s life is put in danger during a hostage situation.