Quadraxis
"What do you think we are, Human?"
King of the Machines
Quadraxis, although he will play a different part in Echoes, is the ruler of the planet Hydra, which her inhabitants are machines. In the early yeas of the space age, a great and terrible war was fought between the Organic and the Machines, and we eventually won. As a punishment for the war, all intelligent machines were quarantined to the abandoned planet Hydra, where they could live in peace together. The Machines leader, Quadraxis X (Quadraxis for short), an "out of control" military droid, also created a pact with the Organic: if any organic being was to set foot on their planet, they would nullify all the pacts and treaties with the Organic and possibly start another brutal war.
After the Metroid war is raging, Samus, Adam, and Lumigek are sent to Hydra to recruit Quadraxis X and his massive army of robots to fight with the Galactic Federation. After they land, they are attacked by a small fleet of Quads, but eventually terminate them. After a short series of events, some very violent, they arrive at Quadraxis X's quarters, and try to make a treaty with him. The treaty states that if they fight alongside the Organics, the machines would be free to travel anywhere they want, but the previous treaties and pacts would still be in use, such as a machine cannot attack or threaten an Organic in any way or form.
Quadraxis then makes a deal with Samus, if she beats him in battle, the machines will aid the Organics, but if he wins, all treaties will be nullified and they will again start another war. Samus eventually wins and Quadraxis will aid the Federation.
Although I do not currently know his full purpose in Echoes, but he will play a major role in the later movies.