Terry O’Quinn and Daniel Dae Kim

It's John Locke Terry O'Quinn to the rescue!

The Lost star has officially made his way back to the island — though he's not taking on the battle between good and evil this time. Instead, O'Quinn's Navy Seal Lt. Commander White will help pick up the pieces of the Hawaii Five-0 team after the events of the Season 1 finale, where McGarrett (Alex O'Loughlin) was accused of murdering the governor.

Lost Reunion! Terry O'Quinn will visit Hawaii Five-0

White, who served with McGarrett's dad in Vietnam and trained McGarrett, will also have some answers regarding the murders of McGarrett's parents.

Check out the first trailer for O'Quinn's debut on Hawaii Five-0, which returns Monday, Sept. 19 at 10/9c on CBS.