Lieutenant Jackson is a UNIT officer from the U.S. division — efficient, by-the-book, and slightly territorial. He embodies military professionalism with a hint of nationalistic edge, reflecting the United States' refusal to place its operations under foreign control, even within an international organisation like UNIT. Jackson isn’t overtly antagonistic, but he does bristle at protocol clashes and is wary of British UNIT personnel interfering in “his” theatre of operations.

He is more of a facilitator than a leader in the story, arriving with UNIT reinforcements and quickly establishing defensive coordination. Jackson’s tone is cool, controlled, and cooperative — provided others know their place. He provides a contrast to Courtland’s open scepticism and Kevin’s improvisational diplomacy, offering a stable but rigid counterpoint. (28 dialogues)