Professor Parsons (first name unknown) is a military scientist contracted by the Pentagon to produce or refine plastic explosives. His work is monitored by Agent Hartley, who brings in Agent Michaels as a supervisor. Parsons demonstrates the properties of the explosive to Michaels and Hartley, revealing 50 pounds of the material available for use before adding 25 pounds was lost in the South Pacific. Parsons believes the material is irrevocably lost, but the crate actually washes up in the lagoon on the island where Gilligan and his pet monkey find it.
- Professor Parsons was played by actor Kirk Duncan.