They are:
* The Fallen: A corrupted Prime who was one of the original thirteen Primes.
* Megatron: Leader of the Decepticons.
* Starscream: Megatron's second-in-command.
* Soundwave: Megatron's loyal communication officer.
The Primes are a group of thirteen powerful Transformers who were created by Primus, the creator of the Transformers. The Fallen is the only Prime among the four kings in Transformers 2.