Isadora has taken the role of being a leader (: of Jack and Joe. Isador is good at this role because she is good at solving problems and is supportive to Joe and Jack. Joe's role in the book is to take Jack and Isadora to the Rebles so that they can find a way to get the humans back to Earth and to also get them away from the skeepsso they won't capture them just like they did with the adults. Also his job is to protect them so they won't get eaten by any beast or puddlys so they can get to earth saftly