Juggernaut

The Juggernaut was a large bronze-colored robot armed with two cannons that could pivot over its shoulders (similar to the shoulder cannons of the Samurai Mech).

It was created by Dr. Julien in order to protect the Hidden Workshop from intruders, as well as the resident Treehorns - ironically, it would be destroyed by Zane, another of Dr. Julien's creations.