The Rebel Underground was a resistance group opposed to the dictatorship of Dr. Ivo Robotnik. It was formed in the later years of the war against Robotnik and led by Geoffrey St. John. For some time this organization operated alone, until Geoffrey made contact with the Knothole Freedom Fighters. Afterwords, the two groups worked together on a number of occasions, and after Robotnik's defeat the group was reorganized into a new Royal Secret Service, with Geoffrey St. John eventually becoming the only member of the original group still working as a field agent.