Unicron

Unicron was one of the original primes [ his surename being Unicron Prime ]

History

Unicron found the Star Wars galaxy and told the primes if they harvested all the suns they could have enough Energon to last forever. The other primes refused and killed Unicron for his trechory.

Later when The Fallen [ Starblaster ] was revived by an allspark shard the spirit of Unicron gave The Fallen the use of his old body and Memory Banks so he would still be able to exact revenge on the Primes.