Alexandra "Alex" O'Connor was the girlfriend of John Crichton shortly before he joined IASA. They had a great relationship, and Crichton was even considering proposing to her before she took a medical research job at Stanford University.
Later, Lorana used Crichton's memories of Alex to distract him from helping Zotoh Zhaan on the New Moon of Delvia.
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Alex O'Connor is a character who appeared in one episode of the first season of Farscape.