Mecha Knuckles and E-117 Sigma revealed for Sonic: Scrapnik Island - Tails' Channel

Two new images, in case you missed it.

Preview of IDW Sonic the Hedgehog Issue 51 - Tails' Channel

E-117 Sigma (Sonic the Hedgehog) - IDW Publishing

SynMania, Author at Tails' Channel

Mecha Knuckles Idw (Scrapnik Island) render by Egg84 on DeviantArt

E-117 Sigma, Sonic Wiki Zone

E-117 Sigma by Diegosousa100357 on DeviantArt

Discuss Everything About Sonic Wiki Zone

E-117 Sigma, Sonic Wiki Zone

Nathalie Fourdraine - News - IMDb

Mecha Knuckles and E-117 Sigma revealed for Sonic: Scrapnik Island

E-117 Sigma, Sonic Wiki Zone