Caterkiller (SatAM)

The Caterkiller is a character that appears in the Sonic the Hedgehog television series. It is a mass-produced caterpillar-based robot designed by Dr. Robotnik to safeguard Robotropolis.

Appearance
Caterkillers are purple robotic caterpillars with bodies comprised of orbs. They have large jaws that are adorned with yellow teeth and similarly colored antennae.

Personality
Unlike most of Dr. Robotnik's other creations, Caterkillers display sentience, mocking the doctor's enemies for their failures and shortcomings.

History
With Tails and several other of his friends caught by Dr. Robotnik, Sonic was teased by a Caterkiller about his inability to save Tails, even if he managed to save his other friends.