Unleasher

Unleashers are creatures from the Generation 1 continuity family.

The Unleashers (アンリッシャー Anrisshā) are a primitive and telepathic lifeform that is alien to the Transformers.

Fiction

Story of Binaltech

In a major battle on Cybertron, Megatron used the Unleashers to mount a telepathic attack against the Dinobots. The aliens' abilities reduced the Dinobots into utterly savage beasts that attacked fellow Autobots, forcing their comrades to shut them off. Due to the Unleashers' apparent uselessness against vehicular Transformers, Wheeljack had Grimlock's mind transferred to a Binaltech Ford Mustang body on Earth. Beast in the Machine