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Mecha Knuckles was a robotic-double of Knuckles the Echidna who acted as a minor villain and boss fight in Sonic Advance, beginning as a rather convincing replica of Knuckles (save for pink coloration) Mecha Knuckles soon revealed his true form as a more primitive machine in a style not unlike Silver Sonic.

Games

Mecha Knuckles, a robotic version of Knuckles the Echidna, made an appearance as a boss in Sonic Advance. He had virtually every move Knuckles had, plus the ability to fire rockets from his mouth in his second form. He looks like a magenta Knuckles with yellow gloves at first, but after being struck four times his "armor" will fall off, revealing a metallic echidna with glowing red eyes underneath. After being attacked another four times, the robot explodes. The current player character seems slightly stunned when seeing Mecha Knuckles for the first time, but Knuckles' reaction is comically over-the-top when he sees his robotic doppleganger. He appears in the Angel Island Zone of Sonic Advance.

Comics

Archie Comics

In the Archie Sonic the Hedgehog comics, the Freedom Fighters were once forced to roboticize Knuckles to combat a roboticized version of Sonic, called "Mecha Sonic" and the robotic Knuckles was dubbed "Mecha Knuckles". After a drawn out battle, both combatants were eventually restored to normal.

Sonic the Comic

Main article: Knuckles Metallix

In the British Sonic the Comic, he was a new version of the Metallixes, loyal only to Doctor Ivo Robotnik and with increased strength. It made its debut capturing Sonic for the Drakon Empire Sonic the Comic #108, "The Evil Empire, Part 1" and then acting as a Prosecutor in Sonic's trial-by-combat, and it came very close to killing him until Tails destroyed it by sheer luck. The Metallix was only reused once, as Grimer used it to defeat Sonic so he could discover from him what happened to Robotnik; he then faked things so Sonic wouldn't remember this and instead think he beat Metallix. In its three clashes with Sonic, the Knuckles Metallix has never been defeated. It was shown at one point that Robotnik had a whole army of them, but they were never shown in use and may well have been eliminated when Sonic cleared out Flickies' Island.

           Sonic Villains

Eggman Empire
Dr. Eggman | Orbot | Cubot | Metal Sonic | Mecha Sonic | Silver Sonic | Mecha Knuckles | Metal Knuckles | King Boom Boo | Badniks | Tails Doll | E-100 Alpha | E-101 Beta | E-104 Epsilon | EggRobo | Eggman Enterprises | MeteorTech | SCR-HD | Master Core: ABIS | Time Eater | Infinite (Upcoming)

Team Dark
Shadow the Hedgehog | Rouge the Bat | E-123 Omega

Babylon Rogues
Jet the Hawk | Wave the Swallow

Eggman Nega's Forces
Eggman Nega | Metal Sonic 3.0 Wendy Witchcart | Bearenger the Bear | Carrotia the Rabbit | Fockewulf the Wolf

Deadly Six
Zavok | Zazz | Zeena | Master Zik | Zomom | Zor

Black Arms
Black Doom | Devil Doom

Nocturnus Tribe
Imperator Ix

Team Hooligan
Fang the Sniper | Bean the Dynamite | Bark the Polarbear |

Other
Babylon Guardian | Biolizard | Black Knight | Captain Whisker | Chaos | Dark Gaia | Dark Gaia's Minions | Dr. Fukurokov | Erazor Djinn | Iblis | Mephiles the Dark | Merlina | Scorpius | Shade | Sir Lancelot | Solaris

           DEATH BATTLE Villains

DEATH BATTLE Combatants
Boba Fett | Shang Tsung | Akuma | Zangief | Goomba | Koopa | Riptor | Kratos | Shadow the Hedgehog | Vegeta | Starscream | Dr. Eggman | Eggman Empire | Badniks | Silver Sonic | Mecha Sonic | Mecha Knuckles | E-101 Beta | Shadow Androids | Scratch | Grounder | Metal Sonic | Dr. Wily | Yellow Devil | Guts Man | Metal Man | Slash Man | Magnet Man | Sheep Man | Napalm Man | Pharaoh Man | Bass | Treble | M. Bison | Shao Kahn | Ivy Valentine | The Terminator | Sektor | Fulgore | Gamera | Godzilla | Ryu | Scorpion | Deathstroke | Deadpool | Majin Buu/Kid Buu | Gaara | Segata Sanshiro | Nightmare/Inferno/Soul Edge | Lex Luthor | Black Beast | Darth Vader | Doctor Doom | Donkey Kong | Trish | Jeanne | Bowser | Ganondorf/Ganon | Quicksilver | Sweet Tooth | The Joker | Mewtwo | The Meta | Scout | Doomsday | Bane | Venom | Android 18 | Balrog | Silver Samurai | Shredder

DBX Combatants
Trish | Jeanne | Jango Fett | King Dedede | Sasuke Uchiha | Hiei | Liu Kang | Alucard | Predator | Meta Knight | Broly | Doomsday | Akuma | Vegeta |

Other
Wizard & Boomstick | Possessed Super Saiyan God Goku Pop Vinyl Figure | Sarge