He is first encountered by John Crichton and other members of Moya's crew during Crichton's first year in the Uncharted Territories. Hoping to assess whether or not Earth would be a suitable home for their species to replenish, the Ancients create an elaborate and advanced simulation based around Crichton's memories. When Crichton flies through a wormhole and lands on the replicated Earth, he unknowingly encounters one of the Ancients in the form of his father. Using Crichton's own memories, "Jack" is able to deliver a performance believable enough to fool John. When Crichton finally realizes that there is something very wrong with the Earth he has discovered, he finds and confronts Jack who admits the aliens' deception. Jack explains to John that his species needed a human reaction in ord