Yesss! He’s back! Terry O’Quinn, the former Lost star is joining the cast of Hawaii Five-O. He will play a recurring role of Lt. Commander Joe White, McGarrett’s (O’Loughlin) Navy SEAL training officer who comes to Hawaii to help free his former protege from jail.

This will serve as a reunion between O’Quinn and his “Lost” co-star Daniel Dae Kim. The first teaser for Season 2 surely welcomes him with a big bang as they announce: “Last season, their team was wiped out. Now … one man will come … to the rescue!”

And who is that one man? Not Alex O’Loughlin or any of the other “Five-0″ regulars, but Terry O’Quinn, himself. “Hawaii Five-0″ begins its second season Monday, Sept. 19 on CBS.