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Private Jeff Johnson was a UNIT soldier who served under Brigadier Lethbridge-Stewart. He detected the Third Doctor's distress signal from Reegan's hideout. (TV: The Ambassadors of Death)

He and Liz Shaw went out together for a while. However, he left soon after the events involving Mars Probe 7 and became part of the regular army. (PROSE: The Scales of Injustice)

Behind the scenes