Beetle Drones are the second and current robotic army of Aku in Samurai Jack.
After Aku created the X-Models, he considered them useless as all but one got killed. As a result, Aku and his scientists created the Beetle Drones. When Jack arrived at the future, he attacked Aku's army of Beetle Drones at a mining outpost. During Jack's journey back into time, Aku kept sending his robots to destroy Jack. They have been upgraded to fly.
Fifty Years Later
The Beetle Drones have been redesigned with red eyes.