Kimee Balmilero

A dark secret resurfaces when Jenna Cavanaugh returns to Rosewood; the girls deal with questions surrounding Alison's death.

A Hawaiian history buff tries to help Five-0 with their investigation of a man dressed as a Hawaiian NaKoa warrior who was found murdered in the jungle.

When the bodies of two serial killers are found on Five-0 property with chess pieces in their mouths, McGarrett and the team hunt for a vigilante as fear grows that tourists aren't safe in Hawaii. Rosalind Chao guest stars as Governor Keiko Mahoe.

Five-0 must work with rogue MI-6 agent Harry Langford (guest star Chris Vance) to find a terrorist planning to cause nuclear reactors across Europe to meltdown. Also, McGarrett and Danny ask retired FBI profiler Alicia Brown (guest star Claire Forlani) to help them find their serial killer vigilante.

When FBI Profiler Alicia Brown (Claire Forlani) finds a body in her bed, she is forced to join McGarrett in the hunt for the chess-piece killer. Also, Kono reconnects with a former surfing competitor (Kanya Sesser), who is now a disabled and homeless war vet. Elizabeth Röhm also guest stars as a police psychiatrist.