The aftermath from the detonation of the hydrogen bomb is revealed.
While the team investigates a couple's murder in which their sons are the prime suspects, McGarrett is shocked when Aunt Deb returns to the island with her new fiance. Entertainment legends Carol Burnett and Frankie Valli guest star.
McGarrett and Five-0 once again become entangled in the twisted mind games of serial killer Dr. Madison Gray (Elizabeth Röhm) when she stumbles into HPD covered in blood that matches Alicia Brown's (Claire Forlani), and claims amnesia.
Magnum must help Rick's crush, Toni (guest star Jamie-Lynn Sigler), after her illegal poker game, organized to pay back a mob debt, is robbed by masked gunmen.
