The Metarex Empire is an evil Race of Robotic Aliens and a Faction Ruled by a Leader, Dark Oak and his Four Leaders. They are Common Enemies and was Responsible for the Destruction of the Nation's Battleships and a Fleet, by Sonic. The Metarex are Truly allied with the Eponymous Dark Universal Empire, The Ultimate Governmental Faction.
- Metarex Trooper
- Naga Metarex
- Metarex Pilot (Similar to Bocoe)
- Metarex Scout (Similar to Decoe)
- Metarex Carrier
Although Metarex Does not have vehicles, But the Troopers do have the Ability to Transform into vehicles due to Megatron's Energon activity.
- Metarex Battleship
- Metarex Frigate