Ultimate Power

The Ultimate Power was alluded to in a message originating from the Alimbic Cluster prior to Metroid Prime Hunters. The message was broadcasted to many in different languages, dialects and even slangs, but all translated down to the same above message.

Seven bounty hunters, Samus Aran, Sylux, Weavel, Spire, Noxus, Kanden and Trace, travelled to the source of the message in the Alimbic Cluster. The true source lied within the Oubliette, an Alimbic prison hidden in another dimension. Some hunters, such as Samus and Weavel, were employed to find the power, others, such as Spire and Noxus, wanted to secure it for the purposes of good, and the rest wanted it just for themselves.

The hunters found that they could not easily access the message's source, they would need eight Octoliths, keys which were already heavily guarded to open the Infinity Void and thus allow access to the Oubliette. Samus arrived there after collecting all Octoliths and battling the other hunters many times, finding them firing at a curious object in hopes of getting the Ultimate Power. To their horror, instead emerged a monstrous being named Gorea that assimilated their weapons. While the hunters fled in shame, Samus was left behind to fight the creature.

It is never explicitly stated what the Ultimate Power actually was. Theories have lead to it being a lie broadcasted by Gorea to lure someone into opening the Infinity Void, eventually allowing it to escape from its prison and wreak havoc on the galaxy. Other theories suggest that it is Gorea itself, since it posed a serious threat to the universe, or the Omega Cannon, a weapon hidden deep inside the Oubliette which Samus later used to finish it off.