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Mecha Sonic Mk. II. The new and improved model of the behemoth that Sonic destroyed in Sonic the Hedgehog 2.

— Description, Sonic the Hedgehog Encyclo-speed-ia

Mecha Sonic[5] (メカソニック[6][7] Meka Sonikku?), also known as Metal Sonic,[3] the Evil Sonic,[1] or Mecha Sonic Mk. II,[2] is a character that appears in the Sonic the Hedgehog series. It is a powerful robot built by Dr. Robotnik that served the doctor during the second part of the Angel Island incident, and an improved model of the first Mecha Sonic.[2]


Mecha Sonic is a robot built in the image of Sonic; thus, it is mostly built out of blue metal, with light blue-colored metal on its belly and muzzle. Its head has metal fins designed like Sonic's quills and a pair of triangular "ears". Mecha Sonic's feet are red-colored with a white stripe in the middle, resembling Sonic's shoes. It also has an horizontal optic sensor as eyes.


Sonic the Hedgehog 3 & Knuckles

In Sonic & Knuckles, and its lock-on version Sonic the Hedgehog 3 & Knuckles, Mecha Sonic fought Sonic and Tails in Sky Sanctuary Zone, where it piloted Dr. Robotnik's Egg Mobile during three failed attempts to defeat the duo. After failing to destroy them, it fought against the heroes itself, but it was ultimately defeated, but not destroyed.

A while later, Mecha Sonic and an Eggrobo teamed up to defeat Knuckles in Sky Sanctuary Zone. However, Mecha Sonic ended up accidentally destroying the Eggrobo instead when Knuckles escaped the latter's grasp while Mecha Sonic tried hitting him with its Spin Attack. It proceeded to battle Knuckles itself, but was defeated. However, Mecha Sonic was still not entirely destroyed, and rushed to the stolen Master Emerald which it used to attain a Super State to defeat Knuckles with. Despite the odds though, Mecha Sonic was ultimately defeated while Sky Sanctuary Zone began to crumble. Fortunately, Knuckles escaped with the Master Emerald thanks to Sonic.

Other game appearances

Blue Sphere

In Blue Sphere, Mecha Sonic appears on the difficulty screen, where it represents the sixth difficulty level of the game.

Powers and abilities

Mecha Sonic is quite agile in movement; by using its mechanic feet, it can achieve high-speed dashes in forward and opposite directions. Much like the previous model, Mecha Sonic can also perform the Spin Attack, both on the ground and in mid-air.[4] As such, it can perform mid-air dashes, roll on the ground at high speed and do rapid Spin Jumps in mid-air. It is also an adapt pilot, being able to pilot the Egg Mobile and its add-ons. Lastly, it is able to harness chaos energy in order to empower itself.

Super transformation

Main article: Super Mecha Sonic

By harnessing the power of the Master Emerald, Mecha Sonic can enter a Super State, transforming it into Super Mecha Sonic. In this form, Mecha Sonic's powers greatly surpass its normal ones, and it is virtually invulnerable. However, this form requires a constant supply of the energy from the Master Emerald to be sustained.


Mecha Sonic is the boss of Sky Sanctuary Zone in Sonic & Knuckles and Sonic the Hedgehog 3 & Knuckles. As Sonic, it is the thirdteenth boss overall in Sonic & Knuckles, and the twenty-fifth boss in Sonic the Hedgehog 3 & Knuckles; while as Knuckles, it is the tenth boss overall in Sonic & Knuckles, and the twenty-second boss in Sonic the Hedgehog 3 & Knuckles. In Sonic & Knuckles, it is fought with either Sonic or Knuckles, while in Sonic the Hedgehog 3 & Knuckles, it can also be fought with Tails, either by himself or as Sonic's partner.

Boss guide

In Sonic's version of Sky Sanctuary Zone, Mecha Sonic is the end boss of the zone, appearing without any Egg Mobile add-ons unlike his previous attempts. The battle in Sonic's story takes place in a wide arena next to a tall tower, which is accessed by using a Warp Point below the arena. After transporting to the arena, Mecha Sonic dashes across the arena while destroying the Warp Point, forcing the player to defeat the mechanized robot in order to reach to the Death Egg. When Mecha Sonic reveals himself at the end of Knuckles' story, he destroys Eggrobo and is ready to face the echidna himself while the Floating Island is seen slowly swaying downward in the background. Battles on both stories are identical.

Mecha Sonic is known to have different attack patterns, which are loosely similar to the previous Mecha Sonic's attack movements from the Death Egg Zone of Sonic the Hedgehog 2. In his first attack pattern, Mecha Sonic starts off by making a medium-sized jump from the corner to the center of the arena, does his variation of the Spin Attack to the left corner from above, then returns back to his idle standing position for a moment. In the second one, he jumps and dashes from the corner before landing in the other corner, assuming his standing mode. During the third pattern, Mecha Sonic does a small leap to the arena's center in his spiky ball mode before doing a larger leap that reaches to the other corner. After that, he spins in mid-air for a second before he lands in his standing mode for a short time. The last pattern features Mecha Sonic floating and then dashing through the air directly to other corner.

The player must watch out during the end of some of the patterns, because after landing in the corner, Mecha Sonic may squat down and dash backward to the other corner before standing upright, attempting to poke the player with his spines as he dashes backwards. The only moment when the player is able to hit Mecha Sonic is when he is standing upright. During both fights, Mecha Sonic takes eight hits to defeat, as after that, he kneels down and starts to short circuit as electricity crackles across his body.


This robot was not named in any instruction manuals accompanying Sonic & Knuckles, but the description on the back of the U.S. release box originally referred to him as "Metal Sonic".[3] In Japan, he was named "Mecha Sonic" (メカソニック) in two guide books: Sonic Jam Official Guide and Sonic Mega Collection Saikyou Kouryaku Guide.[6][7] A third, unique name, "Evil Sonic", was used to describe him in a Sonic The Comic Q Zone in the U.K.[1]

Mecha Sonic was confirmed as his current name in the backstory for Sonic the Hedgehog 4: Episode I, released in the Story section of the official English-language website, implying that this Mecha Sonic is directly rebuilt from Sonic the Hedgehog 2.[5]

In addition to confirming him as an upgrade from the Sonic the Hedgehog 2 model, Sonic the Hedgehog Encyclo-speed-ia refers to him as "Mecha Sonic Mk. II".[2]

In other media

Sonic the Comic

A Metallix robot based on Mecha Sonic appeared in Sonic the Comic's adaptation of Sonic & Knuckles. He stole the Master Emerald from the Hidden Palace Zone and was followed by Sonic and Knuckles to the Sky Sanctuary Zone. As in the game, he super-charged himself with the Master Emerald's energy, becoming invincible. However, he was defeated by Super Sonic when Sonic tried the same trick.[8]

Archie Comics

Main article: Mecha Sonic (Archie)

Mecha Sonic, from Sonic Super Digest #12.

In the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics, Mecha Sonic was used for Dr. Eggman's invasion of Angel Island. While it failed to stop Sonic, Dr. Julian Snively used Mecha Sonic to try to steal the Master Emerald.

IDW Publishing

Main article: Mecha Sonic (IDW)

In the Sonic the Hedgehog comic series and its spin-offs published by IDW Publishing, Mecha Sonic is a robot from another dimension set in the recent past that Sonic once encountered.


  • Mecha Sonic is the first villain to manage to achieve a Super State, the first inorganic character to ever use a Super State, and the very first overall to trigger a transformation by use of the Master Emerald (the next would be Imperator Ix, over a decade later). Classic Metal Sonic would also attempt to trigger a transformation via the Master Emerald in Sonic Mania Adventures, although Knuckles knocked him away before he could succeed.
    • He is also the only character with a Super State that does not last long, forcing him to retreat to the Master Emerald for another charge up. The second half of the battle displays him remaining in his Super State and no longer needing the Master Emerald to maintain it, though he is seen periodically reverting back to his normal form and then quickly powering up afterwards, hinting that his Super State is also the only Super State that is not stable.

Mecha Sonic's cameo in Gale Racer.

  • Mecha Sonic makes a cameo appearance as a key chain along with several other Sonic characters in the Sega game Gale Racer, the Sega Saturn version of Rad Mobile released in 1994.
  • The first phase of Mecha Sonic's battle theme during Knuckles' playthrough is the same as the one that plays during the battle with Big Arm (in Sonic the Hedgehog 3) and Giant Eggman Robo, and his battle theme during the second phase is the same as the music that plays in The Doomsday Zone.
  • Mecha Sonic's fate in Knuckles' story depends on whether or not the player has collected all of the Chaos Emeralds (or Super Emeralds if playing Sonic the Hedgehog 3 & Knuckles). If the Emeralds are not collected, then Knuckles will lose the Master Emerald, and Mecha Sonic will reactivate with the Master Emerald in his possession again. If all Emeralds are collected, then Mecha Sonic will be last seen breaking apart and Knuckles will reclaim the Master Emerald.




  1. 1.0 1.1 1.2 Sonic the Comic #44, "Sonic & Knuckles Special Part 2"
  2. 2.0 2.1 2.2 2.3 Flynn, Ian; Sega (8 December 2021). "Sonic & Knuckles". Sonic the Hedgehog Encyclo-speed-ia. Dark Horse Books. p. 55. ISBN 978-1506719276. "Boss: Mecha Sonic Mk. II. The new and improved model of the behemoth that Sonic destroyed in Sonic the Hedgehog 2."
  3. 3.0 3.1 3.2 "Play as Knuckles and tackle Robotnik and Metal Sonic with bare-fisted attacks, high-speed glides and wall-climbing power!" - Sonic & Knuckles back of the U.S. box.
  4. 4.0 4.1 Flynn, Ian; Sega (8 December 2021). Sonic the Hedgehog Encyclo-speed-ia. Dark Horse Books. p. 55. ISBN 978-1506719276. "Boss: Mecha Sonic Mk. II The new and improved model of the behemoth that Sonic destroyed in Sonic the Hedgehog 2. It attacks in three waves: - *In the Sonic the Hedgehog Egg Wrecker - *In the Sonic the Hedgehog 2 Egg Bouncer - *Personally, with high-speed dashes and bouncing Spin Attacks."
  5. 5.0 5.1 Sonic The Hedgehog 4 Episode I (English). Sega. Archived from the original on 30 May 2013. Retrieved on 26 January 2015. "As Knuckles finished his showdown with Mecha Sonic, the real hedgehog chases Eggman through space, ultimately destroying his doomsday plans - with it, the Death Egg saga comes to a close."
  6. 6.0 6.1 (in Japanese) ソニックジャム オフィシャルガイド. SoftBank. 2 October 1997. p. 87. ISBN 978-4797303377.
  7. 7.0 7.1 (in Japanese) ソニックメガコレクション最強攻略ガイド. Shogakukan. 1 March 2003. p. 180. ISBN 978-4091060907.
  8. Sonic the Comic #49 and #50, "Count Down to Disaster"

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