In the series Transformers Prime Terrorcons are referred to the zombie army that were raised from the dead by Megatron who used Dark Energon to do this. Terrorcons are nightmarsh creatures which look similiar to a transformer except they have deformed arms and limbs (because they have been raised from the dead) which makes them look more like a 'zombie'. They are made from the dead remains of both Autobot and Decepticon corpses. Furthermore in the series Megatron revives all of Cybertron's undead which he planned to
use to invade earth but the space bridge in which the undead were travelling through was destroyed by the Autobots.