Sonic News Network

Know something we don't about Sonic? Don't hesitate in signing up today! It's fast, free, and easy, and you will get a wealth of new abilities, and it also hides your IP address from public view. We are in need of content, and everyone has something to contribute!

If you have an account, please log in.


Sonic News Network
Sonic News Network

A rhino beetle with a buzz saw and a one-track mind.

— Description, Sonic the Hedgehog Encyclo-speed-ia

The Robot Beetle[1] (メカブ[2] Mekabu?, lit. “Mecha Bu”), also known as the Mecha-Bu,[3] is an enemy that appears in the Sonic the Hedgehog series. It is a mass-produced, rhino beetle-based Badnik model created by Dr. Robotnik with a buzz-saw for a horn.


The Robot Beetles resemble Japanese rhinoceros beetles. They have a navy blue body with two yellow, red-capped rear-wheels and two small grey forelimbs which have small black wheels with red hubcaps for hands. On the front they have a black face with two cartoonish black eyes, a yellow jaw cap and yellow helmet. Attached to their face is a horn with a buzz-saw.



In Sonic the Hedgehog CD, Robot Beetles[1] (メカブ[2] Mekabu?, lit. “Mecha Bu”), also known as Mecha-Bus,[3] appear as enemies that are encountered in Metallic Madness.

In gameplay, the Robot Beetles roll slowly forward and backward along the ground within their designated areas. Usually, they have their buzz-saws raised, but when the playable character comes nearby, they will lower them and glide them along the ground. In addition, they are unable to turn around, which makes them vulnerable to attacks from the rear, as attacks from the front can end easily result in the playable character taking damage from their buzz-saws.

In the Bad Future or sometimes in the Present timeline of the Rounds, Robot Beetles are one of the few Badniks who do not show decay, thus remaining pristine in appearance. However, such Robot Beetles cannot move their buzz-saws. Also, like every Badnik in the game, they are powered by Little Planet flower seeds which will pop out of them after they are defeated.

Three Robot Beetles also appear during the end cinematics of the game, in an area similar to Wacky Workbench (despite not appearing there in gameplay). Here, they suddenly attack Sonic, destroying the platform he is standing on. Soon after though, Sonic jumps onto the back of a Robot Beetle. The Robot Beetle behind him tries to attack Sonic with its buzz-saw, but ends up stabbing it into its companion. Soon after, both robots explode, while Sonic destroys the third one by himself.


Accordingly, the Robot Beetles possess one-track minds.[3]

Powers and abilities

Mecha-Bus are each equipped with a buzz-saw on their horns which they can use to cut their opponents.


Concept artwork




  1. 1.0 1.1 The Robot Beetle moves around brandishing its horn with integral circular saw at enemies! - Sonic the Hedgehog CD PC port help file.
  2. 2.0 2.1 Sonic the Hedgehog CD (Sega Mega-CD) Japanese instruction manual, pg. 32.
  3. 3.0 3.1 3.2 Flynn, Ian; Sega (8 December 2021). "Sonic CD". Sonic the Hedgehog Encyclo-speed-ia. Dark Horse Books. p. 33. ISBN 978-1506719276. "Mecha-Bu - A rhino beetle with a buzz saw and a one-track mind."