Harry Slocum was a South African technician who worked 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, Slocum killed a UNIT soldier and knocked out technician John Bromley, infecting him, and increased the Project's power output to maximum.
When Slocum confronted the Third Doctor, Private Wyatt shot Slocum twice through the heart, killing him, but not before Wyatt became infected himself. (TV: Inferno)
Behind the scenes
- The actor who played Harry Slocum, Walter Randall, was from South Africa and used his native accent to portray the role.