Ancient Decepticon
The Ancient Decepticons are a group of Decepticons from the Transformers: Cybertron portion of the Unicron Trilogy.
The Ancient Decepticons are a group of Decepticons who disguised themselves as monsters in the Earth's past.
Fiction
Cybertron cartoon continuity
The Transformers who would become the Ancient Decepticons came to Earth during the space bridge project centuries ago. Stranded on Earth, they took the form of monsters that inspired legends of fantastic creatures in humans (they apparently had the ability to project an image around themselves that made them appear as fantastic beasts rather than giant robots). Presumably, these Transformers are the same who inhabited the starship Atlantis and left artifacts discovered by Dr. Lucy Suzuki.
These Decepticons were opposed by Evac and Crosswise, who over the course of many years imprisoned them in stasis pods, which they stored in an underground chamber in the far North.
Eons later, Starscream would discover this chamber, and destroyed the sealing device leaving them in stasis. Starscream adopted these Transformers as his personal army, and used them to both oppose the Autobots and attempt to track down Earth's Cyber Planet Key. However, they were quickly defeated and re-sealed.
Later, Evac would free the Ancient Decepticons, who he convinced to help him battle Galvatron. This apparently earned them their freedom, as they were later seen joining the new space bridge project.
Thunderblast and Lugnutz were part of this generation of Transformers.
