Rexxon

Rexxon was a robotic snake-like monster that first appeared in Sonic the Hedgehog #6, in the Toxic Caves of the Veg-O-Fortress. Rexxon grabbed Sonic the Hedgehog by the fur, when he entered the fortress, and took him to the level boss, Scorpius. Scorpius and Rexxon were quickly beaten by Sonic, though.

Background Information
Rexxon is named after the gas station, Exxon, considering that he was slithering in oil.