In the season premiere episode, McGarrett and Wo Fat make a narrow escape from maximum security, gunman storm Five-0 headquarters and Catherine is taken hostage. Now, in McGarrett’s quest to save Catherine, he must break the rules and go head-to-head with new SWAT Commander Captain Grover (Chi McBride). Meanwhile, Kono and Adam’s secret location in Hong Kong is compromised.
Episode number: 4x1 Airdate: Friday September 27th, 2013
Co-executive Producer and Showrunner Peter Lenkov's daughter Ariel Lenkov is seem as an extra standing next to Kamekona outside HQ. She also got to work with costume department for the first 2 weeks of filming 4.01.