Bob Williams is a character from the Thunderbirds episode Cry Wolf. He is first rescued by Scott Tracy but it turns out he was just pretending he was in danger. In order to teach him a lesson he and his brother Tony Williams are invited to Tracy Island.
Later He and his brother Tony get trapped in an abandoned tin mine after The Hood deliberately blows up the entrance. International Rescue think it's another prank and at first don't come to help.
He and Tony are massive super fans of International Rescue as seen by them wearing their own sashs, riding a Thunderbird 2 go kart and creating their own slide which Scott tries but later ended up riding their go kart and crashed into their chicken choop and landing in a dustbin.
He was voiced by Sylvia Anderson.