This guy is bad news. Terrorism, weapons, uranium, nukes. Someone's got to stop him.
~ Jack McClane to his father, John

John "Jack" McClane, Jr. is the son of John McClane and Holly Gennero and the younger brother of Lucy McClane. He is seen very briefly in Die Hard as a young boy and was never seen again until the fourth sequel A Good Day to Die Hard as the deuteragonist, whom he is an undercover CIA agent set to stop when a weapons-grade uranium heist by terrorists.

He is played by Jai Couretney in Good Day to Die Hard.

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