Hulko-Droid

The Hulko-Droid was a robot built by Slimy (Grimer's cousin). Slimy unleashed the Hulko-Droid on a local village, hoping to win Robotnik's favour. However, the Hulko-Droid was defeated when Tails (whom Slimy had earlier shrunk with a reducing ray) got through a gap in the robot's armour and pulled out its wiring from the inside.