As it would turn out, John Locke may be the key to Steve McGarrett’s freedom.

The first trailer for the second season of CBS’ high-octane Hawaii Five-0 is out, and it offers the first video of Lost alum Terry O’Quinn as Joe White, the Navy Seal Lt. Commander who taught McGarrett (played by Alex O’Loughlin) everything he knows — except how to stay out of jail, apparently.

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Also within the promo, Losties can also enjoy the reunion of O’Quinn and Danial Dae Kim, whose Chin Ho Kelly gives McGarrett’s mentor a warm welcome to their world.

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Check out the full trailer below. Five-0 premieres its new season Monday, Sept. 19, at 10/9c.