Unicron

Unicron is a robotic organism from the Transformers universe.

History
Unicron is the enemy of all Transformer factions, being the fabled destroyer of Cybertron.

His existance goes back probably to the very creation of the Transformers, having descized himself as a moon to transend the countless ages. It is possible that he is the largest and most powerfull Transfomer in existance (with the exeption of Primus who is sercertly the planet Cybertron itself), having the ability to to resurect, creat vast armies of drones and give imense power to whom he wishes. One example of this is Unicron finding Megatrons dieing body floating through space And in exchange for his services repaired and upgraded Megatron into the far more powerfull Galvatron.

He has beed defeated many times but never totally destroyed one of these was when both the Decepticons and the Autobots set aside the war and joind forces to defeat unicron and stop him from destroying Cybertron.