Energy vampire

'Cause this is Thriller! Thriller night!

An energy vampire is a robotic lifeform who has had their energy drained by the monstrous beast known as the Dweller. Upon contact with the Dweller, its victims become gray-skinned, red-eyed, and mindless. They begin shambling around, drawn towards those who have not yet been turned. Simply touching another spreads the malady. Ultimately, they all return to the Dweller, delivering their captured energy to it.

According to Perceptor, this phenomenon is a form of energy depletion, turning the affected into energy leeches. He correctly theorized that a massive energy infusion could return a vampirized robot to normal.

Fiction

The Transformers cartoon

Once the Dweller was released from its prison, it began draining the energy of any Transformer it attacked. Those who suffered from the attacks became energy vampires which began to attack others on Cybertron. The Dweller in the Depths

3H comics

The inhabitants of the planet Arkus were either killed or turned into energy vampires when the Quintessons dropped the Dweller on their world. Betrayal

Cybertron comic

Scorponok awakened on Cybertron with a thirst for Energon and living Sparks. Balancing Act, Part 2 Ramjet commented that he had seen Spark maladies of this sort before, and that Scorponok's victims would become energy vampires themselves. Balancing Act, Part 3 Vector Prime believed that something might have been done to help Scorponok, had they possessed a Cyber Planet Key. Balancing Act, Part 4