Metal Sonic (メタルソニック Metaru Sonikku?) is the secondary antagonist of the Sonic the Hedgehog series. He is an evil ultra-high performance Badnik version of Sonic the Hedgehog created by Dr. Eggman for the sole purpose of destroying Sonic. The brainchild of Eggman, he is by far the doctor's greatest Badnik enemy robot creation. Deployed during Eggman's operations on Little Planet, Metal Sonic confronted Sonic in battle and lost, though he would repeatedly return to challenge Sonic and his allies. Modeled with extreme accuracy after Sonic, Metal Sonic not only resembles his template but can also imitate his moves and achieve velocities matching and even exceeding those of Sonic's.
While usually serving as Eggman's obedient and silent enforcer, Metal Sonic is an intelligent machine with a very dark side. A cold-hearted, aggressive, and ruthless killer, he is obsessed with proving his superiority to Sonic and eliminating him for good to the point where he has rebelled against Eggman more than once to achieve his goal. However, he always fails in the end, only to later return more powerful than before. To this day, Metal Sonic remains one of Sonic's most dangerous foes.
- 1 Concept and creation
- 2 Appearance
- 3 Personality
- 4 Powers and abilities
- 5 Weaknesses
- 6 Specifications
- 7 Relationships
- 8 References
Concept and creation
Naoto Ohshima wanted to introduce a new rival for Sonic in Sonic the Hedgehog CD. Kazuyuki Hoshino had a clear idea in his head when he was briefed. One of the keywords for this new rival was "menacing" and his design flowed from a concept. Things did not just have to be perfect, but just have meaning to their design. His glowing red eyes was one of the things decided upon by the team and would give him a deadly, intimidating look. His jet engine in his chest gave him the speed to match, exceed, and rival Sonic's speed, and the glossy reflective finish with CGI trends made Metal Sonic feel like a true nemesis and rival to Sonic and would be advertised on the box artwork along with Sonic.
Metal Sonic was created in the image of Sonic the Hedgehog and is thus mostly built of blue metal. He has a yellow circular depression in his chest with a black center, mirroring the peach skin on Sonic's chest. His head has metal fins resembling Sonic's quills and a pair of triangular "ears." Metal Sonic has a muzzle, shoulder plates, upper arms, legs, and fingers made out of silvery metal. His palms are black, while the backs of his hands are square yellow plates. His forearms and lower legs are blue metal like his head and torso, and he has red feet with white stripes designed to resemble Sonic's shoes. He has optic sensors with black sclera and red irises.
Following the Ifrit incident, Metal Sonic received a slight update in design which made him taller and gave him a more ellipsoid torso. He also gained more detailed hands, a brilliant blue paint job, joints on his arms and legs, and sharper eyeholes.
Despite being built to match Sonic the Hedgehog in all aspects, Metal Sonic is the exact opposite of his organic counterpart in terms of personality. Rather than fun-loving, adventurous, and carefree, Metal Sonic is a cold, dark, aggressive, mysterious and outwardly emotionless machine with a large superiority complex. Early on though, he had a habit of mimicking Sonic's gestures, perhaps in a mocking manner. Notably, Metal Sonic is also completely mute, being only capable of making beeping and buzzing noises.
Most of the time, Metal Sonic is Dr. Eggman's docile and completely obedient enforcer. In addition to being programmed to serve Eggman, Metal Sonic carries only one goal in mind: destroy Sonic using abilities superior to his. However, he is far from being another mindless Badnik. In fact, Metal Sonic is an intelligent and calculative machine thanks to an AI chip given to him by Eggman. Also, in contrast to his emotionless demeanor, he is able to feel emotions and carries a deep capability for vengeance. These traits together has allowed Metal Sonic to fuel his own dark goals of destruction and domination. In battle, Metal Sonic is likewise machine-like in execution and coldly serious. Combined with his muteness, he is a silent killer in every sense of the definition.
While facing a opponent, Metal Sonic is very calculative and systematic, as what one might expect of a mechanical intelligence like himself. Analytic in his approach, he takes into account his strength and weaknesses in order to optimize his performances. However, his computerized mind can also be considered a weakness of his, as it makes him inflexible and unable to anticipate the creativity and unpredictability of organic creatures, which causes his thoughts to be temporarily fragmented in such instances.
Metal Sonic's most dominating trait is his hatred and obsession with Sonic. Having been programmed for the sole purpose of destroying Sonic using abilities superior to his, Metal Sonic is obsessed with the conviction that he is better that Sonic in every way, which he assumes is logical since he possesses the best performance, a tireless body, and plenty of other factors that should make him unbeatable. He even taken this logic further with the belief that his body was designed in Sonic's likeness because it was the best design to defeat him with. His greatest desire is therefore to overthrow the real Sonic and defeat him once and for all. However, since he has never been able to defeat Sonic, he finds himself caught in a logical paradox, unable to figure out a way to defeat Sonic despite possessing all the means to achieve this.
While he is usually another one of Dr. Eggman's robotic slaves, Metal Sonic is also highly sentient for a mechanical being, with his intelligence even being capable of evolving; once, his AI chip led to him becoming self-aware, thereby allowing his ego to take control of himself and prompting him to upgrade his body and take control of the Eggman Empire. At this peak of his newly-acquired independence, Metal Sonic showed himself as a ruthless, controlling, arrogant and cunning rogue with no regard for others. His sense of superiority was likewise elevated as he became self-aware, which led him to becoming a megalomaniac and seeing himself as the master of all living things. To this end, he sought to conquer the world and establish a robot kingdom, with him ruling the world as its most supreme being. However, Metal Sonic's superiority complex, combined with his newfound ego, also made him descend into madness, causing him to adopt the twisted belief that he was the real Sonic and that the original Sonic was his "loathsome copy". After Metal Sonic was defeated by Team Sonic though, Eggman turned him back into a docile battle mech. Even so, Metal Sonic is still able to act independently and upset the plans of his creator for his own desires; during the second World Grand Prix, Metal Sonic disguised himself as Team Dark's E-10000B, even without Dr. Eggman's knowledge, and stole the doctor's data to beat Sonic in Extreme Gear racing.
Despite his many defeats and having his beliefs shaken though, Metal Sonic never gives up and will always pursue his goals with relentless determination and take any means necessary to achieve them, no matter how many setbacks he has to go through. Notably, he sees even his defeats as ways to improve himself for his next confrontation, as they provide him with data that he can reanalyze and use to upgrade himself.
Powers and abilities
Modeled with extreme accuracy after Sonic the Hedgehog, Metal Sonic was made to copy Sonic's every ability and is no less fast or powerful than his organic template. Being Dr. Eggman's most powerful weapon against Sonic, Metal Sonic is able to go toe-to-toe with his template in both battle and other fields, making him one of Dr. Eggman's most powerful and skilled creations. In fact, he has been credited as the strongest robot invented by Eggman in order to defeat Sonic. Furthermore, he is constantly improving himself, returning from each battle and defeat faster and more powerful than before.
Metal Sonic shares Sonic's super speed, which he can achieve using a powerful jet engine-based propulsion system. With this system, Metal Sonic is able to beat Sonic's acceleration, who can instantly accelerate to the speed of sound, and equal Sonic's speed; on a few occasions, Metal Sonic is even able to surpass the speed of Sonic, whose highest known top speed is Mach 5. Even then, Metal Sonic can take his speed even further. By overloading his circuits, Metal Sonic is able to quadruple his speed for a limited time. Using certain techniques, he can even achieve light-speed momentarily. In addition, Metal Sonic also has Sonic's astounding kineticism, precision and reaction time to match his speed. He has profound acrobatic skills and agility, along with enhanced reflexes that lets him avoid any incoming obstacles with precise and delicate movements.
Metal Sonic has both impressive durability and physical strength. His frame consists of monocoque titanium that makes him highly resistant to damage, and he has enough strength to tear his own frame apart by hand. In addition, Metal Sonic comes equipped with several extra abilities due to his mechanoid form. These include a plasma pulse laser that he can fire from the intake on his stomach, telescopically extendable limbs, the ability to generate a seemingly impenetrable force-field, and sufficiently sharp claws. Metal Sonic can even channel internal radioactive force within him to produce powerful energy surges, and, when accelerating to maximum speed, surround himself in an energy field that lets him penetrate any substance caught in his path. Plus, by utilizing his jet engine, Metal Sonic can achieve high-speed flight in any environment; even in a damaged state, he was once capable of interplanetary travel from Little Planet to Earth.
Metal Sonic's arguably most impressive skill is his ability to replicate the abilities and skills of others, similar to a Gizoid. By scanning and copying another being's life data, be it either robots or organic creatures, Metal Sonic can immediately and flawlessly mimic other people's skills and abilities, such as Chaos Powers, ESP, super strength, invisibility, etc. This makes Metal Sonic's skillset near-indefinite. Once, Metal Sonic also demonstrated the ability to shape-shift. As a result, he can cause himself to look and sound like an exact duplicate of any lifeform or robot, wearing virtually any kind of clothing, such as when he posed as Sonic when he kidnapped Froggy and Chocola.
Being a robotic clone of Sonic, Metal Sonic can imitate several of Sonic's signature techniques. The most prominent of these include Sonic's core offensive maneuver: the Spin Attack, a technique where he curls into a concussive ball or cutting disk and directs himself at his targets. With it, Metal Sonic can shred or burrow through just about any substance given enough speed. Highly adept in Sonic's usage of this technique, Metal Sonic can utilize several variants of the Spin Attack for both ground- and aerial maneuvers, including the Spin Dash, Spin Jump, Homing Attack and the Light Speed Attack. Also, due to being modeled after Sonic, Metal Sonic has the ability to predict Sonic's moves.
Neo Metal Sonic
Metal Sonic assumed the form of Neo Metal Sonic for the majority of Sonic Heroes while he copied the other teams' data. While most of Neo Metal Sonic's abilities remain unknown, he is known to be able to shape-shift and has the ability to shoot lightning bolts from his hand.
Using the data from Team Sonic, Team Rose, Team Dark, Team Chaotix and Chaos, and as well as parts of Eggman's other machines, Neo Metal Sonic can transform himself into a super powerful version of himself called Metal Madness. In this form, Metal Sonic possesses a flamethrower, missile launchers, a whip-like tail with spikes, and claws that can shoot spikes and crystals. In this state, he is so powerful that even with the seven Chaos Emeralds, the chances of beating him were slim.
After completing his transformation as Metal Madness, Metal Sonic became Metal Overlord. In this form, he sprouts wings, thus gaining the power of flight. He also gains the ability to use Chaos Control. In this form, he becomes so powerful that even Super State users cannot harm him directly. His attacks are strong enough to stun Super State users, but not enough to penetrate their invulnerability.
By harnessing different variants of Hyper-go-on from Wisps, Metal Sonic can use specific Color Powers to transform into a certain form, such as a drill, a laser, or even an asteroid, each one possessing its own unique abilities. So far, Metal Sonic has been able to transform into the Cyan Laser, Yellow Drill, and Indigo Asteroid. However, these transformations require a steady supply of Hyper-go-on to be maintained.
Despite claiming to have no weaknesses, Metal Sonic has a few design flaws, with a number of his own techniques being detrimental to his internal systems. His Ring Spark Field for example uses so much energy that it deceases his mobility. There is also the V. Maximum Overdrive Attack, which fries his circuity from the overloading process and can possibly destroy him if used for too long. Typically though, Metal Sonic's body just cannot handle the raw speeds he pushes himself to reach, which more often than not causes him to overheat or even self-destruct.
- Main CPU: LIPS AI Eggman Custom Chip. Located in the head, this processor contains three output links. The internal CPU contains a system that is capable of executing mathematically logical enactment and a simultaneous analog neuro-connection between all components. In short, this allows Metal Sonic to react very quickly to certain situations.
- Sub CPU: Neo Super DFX Chip, containing a five-link system connecting to all major body components governs the power control system. A Next Risk Chip Series III, with eight basic loading ports in each eye unit, utilizes RGB imaging in the optical area.
- Frame: Monocoque titanium
- Color coating: Reinforced blue metal tektite
- Main engine: 250cc, 4-valve Orgon Fusion Engine
- Secondary engine: Tesla Power Coil which produces electricity through electromagnetic induction.
- Max power: 256 Kw
Sonic the Hedgehog
Sonic the Hedgehog is Metal Sonic's organic template and arch rival, having been created by Dr. Eggman for the sole purpose of destroying him. Though their appearances are similar, there is a certain difference between the two of them that goes beyond their obvious physical dissimilarities. While Metal Sonic is obsessed with the one purpose he was made for and will eliminate everything not related to that goal, Sonic enjoys life freely and lives for adventure. As such, even though they are both super-speedy hedgehogs (albeit with one of them being a robot), their worldviews are completely different.
Metal Sonic is one of Sonic's earliest foes and his first true rival, being able to copy both his speed and power. Both of them share a strong rivalry with each other. Metal Sonic was first deployed on Little Planet where he kidnapped Amy Rose in front of Sonic, which led to a confrontation with Sonic on Stardust Speedway where Metal Sonic lost to his foe. This defeat would turn Metal Sonic from one viewing Sonic as an enemy into a bitter and deadly rival of the blue hedgehog. However, it can be said that Metal Sonic's first loss to Sonic was more than just the beginning of his rivalry with Sonic, but also a "fated" relationship.
Following his revival by Eggman during Little Planet's return, Metal Sonic had developed a deadly grudge against Sonic and sought to settle the score with him. Notably, he would unleash an unbridled fury around some innocent Animals after just missing Sonic and would go as far as to challenge Sonic to a rematch in the image of their first showdown onboard the Death Egg mk.II, only to be defeated once more. Metal Sonic has since continued to challenge Sonic again and again, steadfastly determined to fulfill his purpose of defeating him, only to face defeat at Sonic's hands or end up with a tie each time. With each defeat however, Metal Sonic's hatred for his doppelganger has only grown, thus making him more determined to beat Sonic. This determination has even made Metal Sonic go against Eggman on at least two ocassions. To Metal Sonic, to miss a opportunity to defeat Sonic is as painful as failing to come to his master's aid, if not more so. Even so, being a mechanical intelligence, Metal Sonic's mind is very analytic and precise when evaluating his feelings of frustrations at Sonic, often declaring the situations with Sonic being victorious or having the advantage as simply "unfavorable".
Since meeting each other, Metal Sonic and Sonic have never once had an instance where their interests align, unlike Sonic and Dr. Eggman. In several cases, Metal Sonic has even been known to go after Sonic on his own without being ordered so by Eggman while also using persuasion tactics to make Sonic challenge him. When he finally gets to face Sonic, Metal Sonic is single-minded about besting him, to the point where nothing else seems to matter except proving himself the better of the two of them. This obsessive desire can make Metal Sonic act rather recklessly and without concern for his own well-being, as he has been known to radicalize himself from the inside out by cutting off all "wasteful" functionalities in his body in order to push his performance (most notably his speed) further, all without concern for the damage he does to his systems and body by pushing them beyond their limits.
While Sonic has many rivals, Metal Sonic is special in his own right. As Sonic's rival, while Metal Sonic is a tremendously powerful combatant, it cannot be denied that a large proportion of Metal Sonic's skills are committed to speed competitions, as he was designed to defeat Sonic by outmatching his speed. As such, Metal Sonic's speed capabilities make him an outstanding rival to Sonic.
Over time, Metal Sonic and Sonic have had countless fights, and nearly every time they meet each other they fight ferociously. Regardless, Sonic always manages to either beat or tie with Metal Sonic in the end. However, Metal Sonic's loses to Sonic have only increased Metal Sonic's hatred for Sonic and endowed him with an unhealthy obsession to surpass and defeat him. This obsession is entirely on-sided, as Metal Sonic is the only one who is so obsessed with speed and making himself the superior hedgehog. At one point, Metal Sonic's hatred and obsession for Sonic pushed him over the brink, making him usurp control of the Eggman Empire and upgrade his own body with the goal of killing Sonic. He even adopted the warped belief that Sonic was his copy and that he was the real Sonic. Also, though Metal Sonic has been known to claim that he has other motives behind his actions, as seen when he sought world domination during the Neo Metal Sonic incident, it can all be traced back to his wish of proving himself superior to Sonic, and, by extension, all others.
As long as Metal Sonic's goal is to defeat the real Sonic, Metal Sonic will always return as a powerful force that stands in opposition to Sonic. Likewise, every time Metal Sonic becomes a big threat to Sonic, the robot will stand up to face him, and although he always loses, he will always return later on as an even greater threat that awaits Sonic. As such, Metal Sonic stands eternally as the strongest thug in Sonic's rogues gallery whose intend is to overthrow Sonic.
Dr. Eggman is Metal Sonic's creator, and Metal Sonic is the only robot of Eggman's that has come the closest to defeating Sonic. Despite Metal Sonic's loss to Sonic in Sonic the Hedgehog CD, Eggman did not lose hope in Metal Sonic, and has since rebuilt him several times to accomplish his various agendas, even to the point of summoning the original back from Little Planet.
Metal Sonic eventually betrayed Eggman due to his increasing hatred for Sonic and seized the Eggman Empire for himself to rule the world, with Metal Sonic's primary objective being to destroy Sonic. It is heavily implied that Eggman regretted this outcome, as he proceeded to answer Team Chaotix's interrogation of who locked him up with a saddened tone. However, Eggman did not give up on Metal Sonic even after that, and so reprogrammed Metal Sonic into his obedient servant again after regaining possession of him. Although Metal Sonic still displays rebellious tendencies, it has not stopped Eggman from using him for different missions. In Mario & Sonic at the Rio 2016 Olympic Games, Eggman and Metal Sonic share a special victory animation, where Eggman expresses his pride in Metal Sonic by patting him on the back, annoying the robot.
Shadow the Hedgehog
Shadow the Hedgehog and Metal Sonic first met each other as enemies, as the former had been working with Sonic and the rest of the teams to distract Metal Sonic in his Metal Madness form. Some time later, in Sonic Rivals 2, Metal Sonic and Shadow became partners due to Dr. Eggman calling Shadow for his assistance. Although they are together for a brief period, Shadow has been shown that he does care for Metal Sonic on some level, as he constantly asks him if he is alright. Also, at the end of the game, when Metal Sonic tears himself open to retrieve the Chaos Emerald within his body, Shadow tells him to stop out of fear that Metal Sonic would destroy himself. Shadow's concern may be due to the similar friendship he had with Omega. He also may think that he was doing this on his own intention as he only needs Eggman to speak for him. Shadow does show some deep concern for him as he even talked to Metal Sonic himself instead of Eggman.
Dr. Eggman Nega
In Sonic Rivals, Eggman Nega and Metal Sonic were allies, although it is unexplained why. It is possible that after Nega turned Eggman into a card, he reprogrammed Metal Sonic to work for him instead of Eggman. However, the alliance ended after Sonic Rivals. In Sonic Rivals 2, not only are Metal Sonic and Eggman Nega enemies, but Nega provides Metal Sonic with his own personal rival. This caused Metal Sonic to view Eggman Nega with contempt, and was determined to defeat him.
- Amy Rose
- Bark the Polar Bear
- Bean the Dynamite
- Big the Cat
- Blaze the Cat
- Charmy Bee
- Cream the Rabbit
- Dodon Pa
- Dr. Eggman (sometimes)
- Dr. Eggman Nega
- Espio the Chameleon
- E-123 Omega
- Fang the Sniper
- Jet the Hawk
- Knuckles the Echidna
- Metal Sonic 3.0
- Mighty the Armadillo
- Miles "Tails" Prower
- Rouge the Bat
- Shadow the Hedgehog
- Silver the Hedgehog
- Sonic the Hedgehog (organic template and arch-nemesis)
- Storm the Albatross
- Vector the Crocodile
- Wave the Swallow
- Hesse, Tyson; GGDG (19 August 2021). "Sonic Colors: Rise of the Wisps - Part 1". Sonic Colors: Rise of the Wisps. Season 1. Episode 1. YouTube.
- Sonic Channel (Japanese). Characters: Metal Sonic. Sega. Archived from the original on 26 May 2019. Retrieved on 3 July 2015.
- Sonic the Hedgehog CD (Sega CD) Japanese instruction booklet, pg. 7.
- Devra Newberger Speregen (2016). Sonic: The Ultimate Character Guide. Scholastic. p. 26-27. ISBN 978-1338033243.
- Sega of America. Metal Sonic. Sonic Characters. Sega of America. Archived from the original on 5 March 2005. Retrieved on 26 October 2017. "Metal Sonic was created by the evil genius, Dr. Eggman, and is one of Sonic's earliest foes. He is modeled with extreme accuracy after our blue hero, giving him the ability to predict Sonic's moves and match his great speed. The red-eyed Badnik first appeared in Sonic CD in 1993."
- Sonic Team (6 February 2004). Sonic Heroes. PlayStation 2. Sega. Area/Level: Metal Overlord. "Metal Overlord: Sonic... I was created for the sole purpose of destroying you. But I could never seem to defeat you! That's why I transformed my own body with my own hands."
- Sumo Digital (21 May 2019). Team Sonic Racing. PlayStation 4. Sega. Area/Level: Chapter 7: The Final Showdown. "Dr. Eggman: They beat you? How could they beat you, Metal Sonic? / Metal Sonic: ... / Dr. Eggman: It's better that you can't talk. Any words out of your mouth would just make me angrier."
- ソニック & メタルソニック (Japanese). Sega. Archived from the original on 21 May 2021. Retrieved on 23 May 2021.
- Sonic Team (6 February 2004). Sonic Heroes. PlayStation 2. Sega. Area/Level: Opening sequence (Last). "Neo Metal Sonic: All living things kneel before your master!"
- Sonic Team (6 February 2004). Sonic Heroes. PlayStation 2. Sega. Area/Level: Metal Overlord. "Metal Overlord: See me as I am, no longer afraid of anything! I shall become the ultimate overlord, ruling as the world's most supreme being!"
- Sonic Team (6 February 2004). Sonic Heroes. PlayStation 2. Sega. Area/Level: Metal Overlord. "Metal Overlord: Long time no see, Sonic, my loathsome copy!"
- Sonic Team (6 February 2004). Sonic Heroes. PlayStation 2. Sega. Area/Level: Metal Overlord. "Metal Overlord: Guooooo! Why?! I had it all! I am the ultimate overlord, Metal Sonic! I am the real Sonic!"
- Sonic Team (10 November 2010). Sonic Free Riders. Xbox 360. Sega. Area/Level: Final Factory. "Eggman: Wha--?! Metal Sonic?! / Sonic: Wait, how did Eggman not know it was him already? / Tails: My guess is, Metal Sonic took the data for himself and passed on fake info to Eggman! / Eggman: NrrrrrrrRRGH! You insolent bucket of bolts! / Metal Sonic: ... / Sonic: Don't tell me, you want... / Omochao: I think Metal Sonic is challenging the real Sonic to a race!"
- Sonic Adventure 2: Battle (Nintendo GameCube) United States instruction booklet, pg. 19.
- Sumo Digital, Feral Interactive (26 February 2010). Sonic & Sega All-Stars Racing (PlayStation 3). Sege, Feral Interactive. "Metal Sonic's character profile: He can mimic Sonic's spin dash and homing attack, and thanks to the jet engine in his torso, he can beat Sonic's acceleration and equal Sonic's speed! He has extra abilities however, due to his mechanoid form. These include his Ring Spark Field, telescopic limbs, and a forcefield known as the Black Shield."
- Character Introduction: Dark/ Villains for 2P battle. Archived from the original on 27 September 2011. Retrieved on 23 June 2015. "A high-performance Sonic robot which was created by Dr. Eggman. The first appearance of Metal Sonic was in Sonic CD. In order to compete with Sonic's speed, Metal Sonic is equipped with a powerful propulsion system, which allows Metal Sonic to accelerate quickly. There are no special attacks which effect his body."
- Sega of America (March 2007). Sonic Central. Sega of America. "From Your Ultimate Fan: How fast can you go (MPH) and how long would it take you to run around the world once? Also, who could beat you in a race, Knuckles, Tails, Shadow, Cream, Rouge, Amy or Dr. Eggman? / Sonic: I have the ability to instantly accelerate to the speed of sound. That's about 760 MPH at 59*F...pretty fast, huh? The only character that would really have a chance against me would be Shadow…but then again, I've never lost a race!"
- Sega. Sonic the Hedgehog 4 Episode II Official website (Japanese). Characters: Metal Sonic. Sega. Archived from the original on 17 August 2017. Retrieved on 30 July 2015.
- Sonic Adventure (Dreamcast) North American instruction manual, p. 18.
- "El arma secreta de Dr. Robotnik" (in Spanish). Hobby Consolas magazine. August 1993. p. 21. "But moreover, his rate of acceleration is 4 times higher when his circuitry is overloaded. When this happens, some interesting blue sparks take off from his body and there arises a chemical reaction called "V. Maximum Overdrive Attack". This power can break through any surface. This can't happen very often, of course, because it would mean the self-destruction of Metal Sonic. Another powerful attack Metal Sonic has is the "Ring Spark Field", a radioactive force that also has its disadvantages: the speed and energy of the robot decreases considerably."
- Very Crazy Penguin (21 May 2007). Metal Sonic profile. Very Crazy Penguin.
- Backbone Entertainment, Sega Studio USA (13 November 2007). Sonic Rivals 2. PlayStation Portable. Area/Level: Ending sequence (Shadow and Metal Sonic).
- Sonic Team (25 February 2015). Sonic Runners. iOS. Sega. Area/Level: Episode 50-4: Boiling Point 4. "Sonic: Broooooooom! / Metal Sonic: Zzzzzzeowww! / Sonic: Uh-uh-uhhh! Not this time! BrrrooooooOOOMMM! / Metal Sonic: ...?! ZzzzzzzzzZZZIP...I (splutter) ZZZZZZZZZIP - Hiss... Fizzz... Kaff! Ssssss... / Tails: Metal Sonic's overheated! He just can't handle the speed!"
- Sonic the Hedgehog CD (Sega CD) Japanese instruction manual, pg. 7.
- Sonic Team, Dimps (15 February 2012). Sonic the Hedgehog 4: Episode Metal. Steam. Sega. Area/Level: Ending sequence.
- Sonic Rivals 2 (PlayStation Portable) United States instructional booklet, p. 8.
- Sonic the Hedgehog 4: Episode II