Quotation1 Stupid G.U.N. Beetle Sentry Drones! They may be weak, but they are relentless! Quotation2
Dr. Eggman, Shadow the Hedgehog

The Mono Beetle (モノビートル Monobītoru?) is a recurring enemy in the Sonic the Hedgehog series. It is a mass-produced robot model deployed by the military organization Guardian Units of Nations, and a part of the Beetle Series. It is the most basic model in the Beetle series, and its design serves as the template for all other robots in its series.

As the Mono Beetles serve as little more than surveillance drones, presumably to support the security functions of G.U.N's bases, they are rather harmless and can occasionally be used as "steps" for Sonic and Shadow to cross by using Homing Attack.


The original Mono Beetles basically resemble grey balls with blue outlines and armor on the front. On top of them, they have a sharp blue cap with a red-striped edge. Below this cap, reaching from just behind the edge of their front armor to far behind their back, they have a horizontal yellow turbine disk with a red and blue-striped frame. On their "face", they also have a single yellow, red and white lens. In Sonic Generations, the Mono Beetles' design was slightly tweaked, where their lenses were colored more red and white and their cap was emblazoned with GUN's symbol and the number "01".

In Shadow the Hedgehog, the Mono Beetles more closely resemble Bomb Wings. In this game, they are green instead, their dish attachments are made thicker (resembling jet engines) and they have a pair of small wings on the sides.

Attack pattern

The Mono Beetle has no method of attack, unlike most other robots in the Beetle series, and will only hover around in the air and damage the player when touched. When a Mono Beetle spies the player, its "eye" will light up and it will bob up and down excitedly. Sometimes, a Mono Beetle can be invisible to the player and will appear out of nowhere when a character comes near it.

Game appearances

Sonic Adventure 2

Metal Harbor, Sonic Adventure 2

A row of Mono Beetles in Metal Harbor.

The Mono Beetle first appeared in Sonic Adventure 2 and Sonic Adventure 2: Battle. They are some of the games' most common enemies and are found in nearly all the games' stages:

Character Stage
Sonic City Escape
Green Forest
Crazy Gadget
Metal Harbor
Tails Prison Lane
Eternal Engine
Knuckles Aquatic Mine
Shadow Radical Highway
White Jungle
Sky Rail
Dr. Eggman Iron Gate
Sand Ocean
Lost Colony
Cosmic Wall
Rouge Dry Lagoon
Security Hall

Shadow the Hedgehog


A Mono Beetle in Shadow the Hedgehog.

The Mono Beetles made their first return in Shadow the Hedgehog. In this game, they are a common enemy in the stages where G.U.N.'s forces can be found, such as Westopolis.

Sonic Generations


A Monno Beetle on Radical Highway in Sonic Generations

The Mono Beetles reappeared once more in Sonic Generations, with their behavior and appearance being just as they were in their original game. They appeared in both acts for Radical Highway on the 3DS version and in both acts for City Escape on the console version.



The Shadow and Mono Beetle figures by Jazwares. Note the year displayed on the package.

This robot was included as a bonus figure with a Shadow figure from Jazwares for the "Sonic through Time" line. On the box however, it reads "2000", which it should be 2001 as it is the year Sonic Adventure 2 was first released. As of 2012, the displayed year still has not been changed despite the fact that Jazwares added a new sticker in place of the 20th anniversary logo.



Main article | Gallery | Beta elements | Staff | Glitches | Re-releases (Battle | 2012)

Main article | Gallery | Library Sequences | Staff | Glitches

Main article | Gallery | Script (Console/PC, 3DS) | Beta elements | Staff (Console/PC, 3DS) | Glitches