Rudy is a tall lizard with an eyepatch.
One night, while Rudy was away from his village, it was attacked by Flybots and many of his friends were infected with a serum that made them loyal to Doctor Robotnik. Rudy managed to escape, and met up with the Sonic Underground team who had come to the wasteland while searching for their mother Queen Aleena. Rudy revealed that he had not seen Aleena, and they agreed to help him deal with the Flybots.
When Manic the Hedgehog was affected by the Flybots' serum, revealing the team's location to Robotnik, Rudy showed the team to a cave where they could hide their van. He later helped Sonic work out a plan to destroy the Flybots, by luring them to a part of the wasteland beset by electrical storms. Some of the Flybots were destroyed by being struck by lightning, and others were shot down by the mounted weapons on the Camper Van.
Rudy speaks in an Australian accent.
- Rudy, like other members of his Freedom Fighter group, wears leather clothes reminiscent of the characters from the film Mad Max 2.