The De-Roboticizer is an object that appears in the Sonic Underground television series. It was a faux device belonging to Titus who used to scam money out of aristocrats by faking its capability to reverse roboticization; as Dr. Robotnik put it, it was "just lights and smoke, no electronics at all."
The De-Roboticizer was invented by Titus, which could supposedly restore roboticized people back to normal and grant people immunization to Roboticization. In truth, the device was a fraud which Titus used to scam fearful aristocrats of their money.
When Robotnik captured Titus, he modified the De-Roboticizer into a real Roboticizer to trap Sonia the Hedgehog. Just before Sonia was roboticized though, Titus suffered an attack of conscience, and pushed her away, getting himself roboticized in the process. The De-Roboticizer was destroyed by Swatbots afterwards.