My 3-year-old boy likes both Batman and Transformers, so I figured I'd give him the (sort of) best of both worlds. I took a non-functioning Topspin, put in a new Choro-Q/Penny Racer motor and dremeled holes for supermagnets so he could actually transform (albeit, manually). In addition, I made a Bat symbol and tried to make his face more Batman-cowl like. A cheap and simple way to make my kid say "COOL!".