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Graham O'Brien is a dropship pilot of the Terran Dominion, described as a good-looking man with freckles. He was so skilled he could land without passengers being immediately aware of this. He had little interest in archaeology.
A few years after the Brood War, with xel'naga artifacts being discovered, he was tasked with the transportation of various archaeological teams to the Nemaka artifact dig sites. While he found his first stop interesting, the interest didn't last.