Harry Slocum

Harry Slocum was a maintenance worker at the Inferno Project. While repairing a drill pipe, he was infected with Stahlman's ooze and rapidly mutated into a Primord. His killing of a fellow worker soon caused UNIT to be brought in to investigate. Later, the creature that had been Slocum knocked out Bromley, infecting him, and increased the Project's power output to maximum. When Slocum confronted the Third Doctor, Private Wyatt shot and killed the unfortunate worker, but not before becoming infected himself. (TV: Inferno)