Lumbiaco is a beast from the Sound World and the main antagonist of episode 31 of Engine Sentai Go-onger.
After the Sound World was destroyed by Kireizky, Lumbiaco somehow found its way to the Human World, where it began feeding on noises to grow giant. Its arrival triggered an alliance between the Go-ongers and the Gaiark to stop it from destroying the world.
Lumbiaco manages to feed on enough sounds to grow giant, but is shrunk by a beautiful melody produced by the G3 Princess idol group formed by Saki Rouyama, Miu Sutou and Kegalesia. Angered by the noise, Lumbiaco goes on a rampage until it is eventually destroyed.