IDW's Sonic the Hedgehog x Godzilla 3 introduces Obsidian Mechagodzilla, a mechanical kaiju powered by the Obsidian Emerald as Dr. Eggman targets Sonic's world.
Godzilla and Sonic Crossover Gives Mechagodzilla the Obsidian Emerald Upgrade
IDW's Sonic the Hedgehog x Godzilla 3 introduces Obsidian Mechagodzilla, a mechanical kaiju powered by the Obsidian Emerald as Dr. Eggman targets Sonic's world.