Lieutenant Jack Scargill was serving onboard the Elivagar Flagship during the miner's rebellion. He acted as second-in-command to Fleet Admiral Nicolina Verona.
Scargill had been working on deep-space mining vessels since he was a young boy, so he is fluent in Rimspeak. Throughout his career he always had the best interests of his fellow miners at heart.
After Captain Vance's takeover of the fleet, he remained loyal to Verona and was locked up in his quarters. Gail Pilgrim rescued him before the ship was destroyed.