This object exists primarily or exclusively within the Sonic Underground continuity.
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.

The Frequency Harmonizer is an object that appears in the Sonic Underground television series. It is a device used to bypass security panels.



The Frequency Harmonizer is a gray, circular device with a t-shaped orange marking on it.

Features and traits

The Frequency Harmonizer can be used to bypass hi-tech security panels.[1]


Manic stole the Frequency Harmonizer from Dr. Robotnik, despite Sonia's objections. The device would later prove to be handy in allowing them to bypass said doctor's security panel.[1]


  1. 1.0 1.1 Hurst, Ben (8 October 1999). "Harmony or Something". Sonic Underground. Season 1. Episode 30. First-run syndication.