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The Energy Inhibitor was a device created by Dr. Robotnik as a means of preventing the exponential growth of the Zone of Silence, which threatened to consume all of reality. Robotnik gave the device to Sonic the Hedgehog after he Mobian destroyed his Photon Cannon, which he had previously been used to keep the Zone's expansion in check. Sonic took it with him as he, Sally Acorn, and Geoffrey St. John entered the Zone in a bid to rescue Maximillian Acorn, Sally's long-lost father. However, deteriorating conditions forced them to activate the Inhibitor, which prevented the Zone's expansion but also forced them out of it before they could save King Acorn. (StH: #36)