Christopher Thorndyke, also known as Chris, was first introduced into Sonic X during the first episode when he rescued Sonic after having fallen into their pool. He lives in a large mansion and both his parents work, his mother a movie star and his father the owner of a large company, they are hardly ever at home, but when emergency strikes they'll rush home. Chris' parents are very overprotective of him.

During Sonic X, Chris develops a very strong bond with Sonic, seeing him as one of his very best friends. He tends to be a bit of a crybaby, but he still tries to be strong.