Mecha-Bu is an insectoid Badnik created by Dr. Eggman. It is modelled after a Japanese rhino beetle and can be found in Sonic CD's final stage, Metallic Madness. Attached to the robot's horn is a circular buzzsaw, which prevents Sonic from attacking it head on. However, the Mecha-Bu cannot turn around and can be destroyed without a problem if Sonic gets behind it.