Metal Knuckles, as seen in Sonic R.
The first Metal Knuckles appeared in Sonic R as a hidden opponent for Reactive Factory. Once beaten, Metal Knuckles is added to the selection of playable characters.
A similar robot appears in Sonic Advance as the Angel Island Zone boss. At first, the boss is identical to Knuckles (except for slightly different colouring), but after a few hits his disguise falls apart, revealing his metal interior.
The very first robot Knuckles - Metallix MKIII - actually appeared in Fleetway's Sonic the Comic.
Characters in the Sonic the Hedgehog game series
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Recurring characters
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Heroes
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Sonic (Super, Starfall, Hyper, Darkspine, the Werehog, Excalibur) | Tails (Super) | Knuckles (Super, Hyper) | Amy (Super, Hyper) | Mighty (Super) | Ray (Super) | Espio | Charmy | Vector | Cream | Big | Blaze (Burning) | Silver (Super) | Sticks
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Anti-heroes/Neutrals
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Shadow (Super) | Rouge | E-102 Gamma | E-123 Omega | Jet | Wave | Storm
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Villains
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Dr. Eggman | Metal Sonic (Rocket, Neo, 3.0) | Mecha Sonic (8-bit, Mk. II, Mk. III, Super) | Fang | Tails Doll | Metal Knuckles | Chaos (Perfect) | E-Series | ZERO | Biolizard (Finalhazard) | Black Doom (Devil Doom) | Eggman Nega | Orbot | Cubot | Deadly Six (Zavok, Zazz, Zomom, Master Zik, Zeena, Zor)
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Teams
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Sonic/Heroes | Rose | Dark | Chaotix | Babylon
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Other
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Animals (Flicky) | Froggy | Chao (Hero, Dark) | Tikal | Pachacamac | Omochao | Chaclon | Gerald & Maria Robotnik | President | King Boom Boo | Cheese | Chocola | Vanilla | G.U.N. Commander | Wisps | Mother Wisp
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