Which character does Alex O'Loughlin play in "Hawaii Five-O"?
Alex O'Loughlin Alex O'Loughlin (born 24 August 1976) is an Australian actor, who plays Lieutenant Commander Steve McGarrett on CBS' remake of the TV series "Hawaii Five-0". He had starring roles in the films "Oyster Farmer" (2004) and "The Back-up Plan" (2010), as well as on such television series as "Moonlight" (2008) and "Three Rivers" (2009).
Jason O'Mara Jason O'Mara (born August 6, 1972) is an Irish-American actor. He has starred in the American television network dramas "In Justice", "Life on Mars", "Terra Nova", "Vegas", and "Agents of S.H.I.E.L.D."