There has been pictures surfaced on the net of McGarrett will be jail in the premiere and judging from the picture below it looks like he'll run in with the killer of his father - Victor Hesse played by James Marsters. This will make his 4th appearance on the show (1 of them wasn't credited). Filming of the jail scenes took place at Halawa Prison in O'ahu.
Source: Peter Lenkov on Twitter
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