Who was the serial killer vigilante?
McGarrett and Danny tried to find out the answer to that on Hawaii Five-0 Season 7 Episode 2 when they teamed up with retired FBI profiler, Alicia Brown.
Meanwhile on this CBS drama series, the team worked with rogue MI-6 agent, Harry Langford to find a terrorist who was planning to cause nuclear reactors across Europe to melt down.
Did the team manage to halt the terrorist?
Use the video above to watch Hawaii Five-0 online to get caught up with the latest drama.
Paul Dailly is a staff writer for TV Fanatic. Follow him on Twitter.