Metal Knuckles
From Sonic Retro
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.
| Sonic the Hedgehog series characters | |
|---|---|
| Heroes | Sonic (Super, Hyper, "Dark Super", Darkspine, the Werehog) | Tails (Super, Turbo) | Knuckles (Super, Hyper) | Amy Rose | Cream | Blaze (Burning) | G.U.N. | Silver (Super) |
| Anti-heroes/Neutrals | Shadow (Super) | Rouge | Chaotix | Mighty | E-102 Gamma | Chaos | E-123 Omega | Emerl | Rogues |
| Villains | Dr. Eggman/Dr. Ivo Robotnik | Metal Sonic | E-Series | Biolizard | Black Arms (Black Doom) | Gemerl | Fang |
| Other | Gerald & Maria Robotnik | Big | Chao | Tikal | E-101 Beta | Flicky | All Characters |
