Rexxon is a large robot that resembles a dragon and/or serpent. It has a metallic green body with a long neck. snout and spines. It possesses a wide mouth with two fangs in its front jaw and maxilla, and two prolonged eyes above its snout with black pupils.
When Sonic the Hedgehog attempted to destroy the Veg-O-Fortress and Dr. Robotnik's robot operations, Rexxon grabbed Sonic by the fur when he entered the fortress, and took him to the Scorpius. Both Scorpius and Rexxon were quickly beaten by Sonic, though.