The subject of this article appeared before the Super Genesis Wave.

Dolph was a member of the Rebel Underground and a mobian chipmunk. He was partners with Jean-Claude and worked with Geoffrey St. John under his command. Both he and Jean Claude helped to destroy the first DYNAMAC robot on the Robotnik Express. (StH: #31)

It is unknown what, if anything, has happened to Dolph and Jean-Claude, as they have not made a reappearance or been mentioned.
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