Sir Charles' Spy Room was a hidden bunker in Robotropolis maintained by Sir Charles Hedgehog during his service in the Robotropolis Spy Network. It was notable for being the site of a meeting between Charles, his nephew Sonic the Hedgehog, and Princess Sally Acorn prior to a massive earthquake ravaging the city. From here, the trio plotted out their efforts to take advantage of Dr. Robotnik's evacuation to save some of his various Robian slaves by restoring them to normal. (StH: #37)
- The spy room was based on identical bunkers found in the Sonic the Hedgehog and Sonic Underground animated series.