Despite their western name, Metal-o-Turtles are based on Kabutomushis (commonly known as "Japanese rhinoceros beetles"). They have blue armor, yellow pincers with red claws, and a large cephalic horn on their heads. They move around with pair of tracked wheels underneath their bodies.
The player only encounters the Metal-o-Turtles in Gigalopolis Zone. In gameplay, all they do is move back and forth. They do not have any proactive offense other than having the player somehow collide with them and inflict damage.
- Metal-o-Turtles closely resemble the Mecha-Bu from Sonic the Hedgehog CD. Both are based on Japanese rhinoceros beetles.
- Despite the fact that they appear to be a beetles rather than turtles, "Metal-o-Turtles" most likely refers to these robots in the Gigapolis Zone description in the English Game Gear manual, since the only other Badnik that appears in that zone is this game's equivalent of Buzz Bombers.
- In the Sonic X episode "Countdown to Chaos", G.U.N. has a tank shaped as a beetle which look a lot like the Metal-o-Turtles.