Episode Title:The Magic School Bus Getting Energized.Episode Description:At the Walkerville carnival the kids are running the Ferris wheel; however, it doesn't work for some reason. Mikey, Carlos' little brother who is wheelchair bound comes to the rescue. Since electric power doesn't work, they decide to use the energy of falling rocks. If the people ride in one side of the Ferris wheel and the rocks land on the other, then it will cause the wheel to turn without hurting anyone. The problem is how to get the rocks to the Ferris wheel. Interestingly, Rachel makes a cameo, since she didn't appear with Ms. Frizzle and her class.