He's the brother of Spigi. He went looking for Fire Mario, for extremely important reasons. He claimed the entire existence might be in danger. Bowser found out Error Weegee is dead, so he sent out Mecha Sonic. He put up a fight against Giganeegee, due to him being a robot of course. But he believed Bowser was behind it. Sadly at the end, he failed to save Fire Mario, and had to run.