HAWAII FIVE-0: What You Need to Know About the Season Premiere

"Ka ʻōwili ʻōka'i" -- After Steve's CIA agent friend is killed, McGarrett lets himself be captured by the group he thinks is responsible and endures a torturous sensory deprivation tank to find the killer. Also, Tani wrestles with whether or not she will tell McGarrett about the murder weapon she found at Adam's house, on the ninth season premiere of HAWAII FIVE-0, Friday, Sept. 28 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Pictured L to R: Shawn Thomsen as Pua Kai and Alex O'Loughlin as Steve McGarrett. Photo: Karen Neal/CBS ("Ka ʻōwili ʻōka'i" is Hawaiian for "Cocoon")