Gribble's real name is George Ribble, and he got to Mars around 1986, when he was about 9 or 10. The Martians had kidnapped his mom, and he wanted to save her. But he got there too late, and the Martians had killed his mother. He stayed on Mars for the next 25 years, inventing things. When a 9-year-old boy named Milo came along, Gribble helped Milo rescue his mom. Meanwhile, Gribble developed a romance with Ki, a Martian, and decided to remain on Mars.