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Jon St. John was the voice actor for Big the Cat, E-123 Omega and E-102 Chaos Gamma in the Sonic the Hedgehog series. He was replaced in 2005 shortly before the death of Deem Bristow. Outside of Sonic, he was also a radio DJ for Top 40 in North Carolina and has voiced Duke Nukem in the series of the same name since 1995.
- St. John was also the menu voice (aka announcer) for Sonic Advance 3.