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|This character exists primarily or exclusively within the Pre-Super Genesis Wave continuity.|
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
The Polysaurus Rex was a two-headed dragon that was thought to be extinct. It guarded two doors in the Forbidden Zone
Described as a "bio-mechanical watchdog", one of its heads would always tell the truth, whilst the other would only tell lies, though it was impossible to discern which one beforehand. Sally Acorn encountered it whilst on her soul-quest from Julayla and was able to outsmart it. (IYF)