Xbox 360 - Sonic the Hedgehog (2006) - Knuckles - The Models Resource

Xbox 360 - Sonic the Hedgehog (2006) - Knuckles - The #1 source for video game models on the internet!

Sonic Recon, Sonic Fanon Wiki

Xbox 360 - Sonic the Hedgehog (2006) - The Models Resource

Sonic Superstars (Video Game) - TV Tropes

Saturn - Sonic 3D Blast - Knuckles - The Spriters Resource

Custom / Edited - Sonic the Hedgehog Customs - The Models Resource

Sonic Adventure 2 (Video Game) - TV Tropes

I'm kinda hoping Sega today decides to explain what all this was

Game Boy / GBC - Sonic 6 (Bootleg) - Sonic and Special Screens

Sonic the Hedgehog (2006) - The Cutting Room Floor

Sonic the Hedgehog 2 (film), Sonic Wiki Zone