|This character exists primarily or exclusively within the Sonic X anime or comic continuity.|
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
It was first seen when Amy Rose angrily throws a coconut into the ocean. It then hits Octoron's head, causing a bump. Octoron then submerges and is not seen for a while. Later, it invaded the Emerald Coast resort along with Eggman and engages a fight with Sonic. When Sonic tries to attack it, Octoron snatches Sonic with one of its tentacles and dunks him in the water before pulling the hedgehog out. It tries to dunk Sonic underwater again, but this time, Sonic attempts to run away from the water. Amy then severs one of its tentacles, causing it to fall into the sea. With the help of a ring, Sonic pierces through Octoron's dome and smashes its insides. It falls and then explodes, destroying it for good.
- Octoron is 15.5 meters (44.5 feet) tall and weighs 550 kg (1212 lbs).