Doctor Adrian Walker was an accomplished human xenobiologist on Earth at the beginning of the 21st century. He was an expert interviewed for the television special called "Alien Visitation" after the crew of Moya arrived on Earth alongside John Crichton.
Walker had an extremely positive view of the encounter, determining that the alien personalities did not seem exceptionally different from those of humans -- and he was thoroughly amazed by some abilities the aliens seemed to demonstrate.
His enthusiasm helped fuel humanity's desire to venture into space for many years after his interview aired.
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Adrian Walker appeared in a series of videos connected to the Farscape universe.