(CNN) -- When we think of the perfect summer blockbuster, we think of action -- and July's "The Wolverine" will have more than enough, star Hugh Jackman says. The 44-year-old is back for another round as the ferocious mutant Logan/Wolverine, but James Mangold's take is somewhat darker than its predecessors. As the trailers have shown, the typically sly Logan appears to be in a pretty serious funk as he's haunted by thoughts of Jean Grey (Famke Janssen). When a man whose life he once saved summons him to Japan, the ageless mutant is presented with an offer of mortality as a so-called expression of gratitude.
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Hugh Jackman returns in "The Wolverine" as the X-Men mutant
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The big question for him in the summer movie is one of mortality
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Jackman ate 6,000 calories and trained for three hours daily in preparation
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"The Wolverine" will be darker but just as action-packed as previous "X-Men" films
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