Freddie Scorpio, or often referred to as "Gold Star", is the son of Hank Scorpio. He is only seen in the episode "Lisa Goes to Camp" when Lisa discovers him attempting to blackmail the United Nations by threatening to vaporize the World's oceans, banking that his saved water stockpile would be enough to raise the money anyway, leaving the World leaders out of options.
At first people see him as bad but in the end, Lisa states that they could be pen pals as long as he leaves the oceans alone. Freddie replies, "gee that would be swell". Gold Star is like his father Hank Scorpio in many ways, like having the same haircut and the same idea of villainy.