Regulon metalmongers are creatures, apparently native to Regulon Four, which are highly dangerous adversaries. Three of them are sufficient to pose a severe threat to a platoon of trained Cybertronian warriors.
The Transformers cartoon
When the Autobots crashed on Nebulos, the experience reminded Kup of the time his platoon was stranded on Regulon Four. While there, the seven hundred strong force came under assault by three Regulon metalmongers. They were seriously outnumbered. Sadly, the Nebulon resistance attacked before Kup could explain how they got out of that dangerous situation.