|First Appearance||Sonic the Hedgehog CD|
Metal Sonic is a robot designed by Dr. Robotnik with Sonic's appearance and abilities that first featured in Sonic the Hedgehog CD. Since then various Metal Sonic's have appeared throughout the series.
Robotic versions of Sonic had appeared previously in the series in both the 8-Bit and 16-Bit versions of Sonic the Hedgehog 2. Although this version, known as Silver Sonic or Mecha Sonic, is quite different to the more commonly recognised Metal Sonic, who appears more dynamic and the definitive model.
Metal Sonic also appears several times as a boss.
- Sonic the Hedgehog CD
- Knuckles Chaotix
- Sonic Triple Trouble
- Sonic Drift 2
- Sonic R
- Sonic Adventure
- Sonic Adventure 2
- Sonic Pinball Party
- Sonic Heroes
- Sonic Rivals
- Sonic Rivals 2
- Mario & Sonic at the Olympic Winter Games
- Sonic the Hedgehog 4
- Sonic Free Riders
- Sonic Generations
- Mario & Sonic at the London 2012 Olympic Games
- Sonic the Hedgehog 4
- Sonic & All-Stars Racing Transformed
 Appearances in Other Media
Metal Sonic appears in Sonic the Hedgehog: The Movie, referred to by Dr. Robotnik as Hyper Metal Sonic and is the main antagonist alongside Dr. Robotnik. He has similar skills and abilities as in the games but also appears to be capable of independent thought.
Metal Sonic features in the following comic series:
- Sonic the Hedgehog (Archie Comics) - Metal Sonic (Archie) full article
- Sonic the Comic - Metallix full article
In the Archie continuity he appears in an adaptation of the Sonic CD storyline, referred to as Mecha Sonic. He appears several times throughout the storyline, having a Power Gem embedded inside him which gives him the ability to rebuild himself.
In the Sonic the Comic storyline, he likewise was introduced in an adaptation of the Sonic CD storyline, in this incarnation referred to as Metallix. After being destroyed by Sonic at the end of the storyline, it became known that this was merely one of a whole army known as the Brotherhood of Metallix.
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