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Little is known about the mysterious bounty hunter known as Sylux, other than the fact that Sylux harbors an intense hatred for the galactic federation and the bounty hunter who has helped the Federation time and time again... Samus Aran.
~ Metroid's official site describing Sylux.
Sylux is a bounty hunter just like Samus Aran and a significant antagonist in the Metroid series. He made his debut appearance in Metroid Prime Hunters. Not much is known about him, except he has a strong hatred for Samus and the Galactic Federation.
Sylux first appears in Metroid Prime: Hunters, along with five other bounty hunters: Kanden, Noxus, Spire, Trace, and Weavel, searching for an "ultimate power" in the Almblic cluster; some of them are more benevolent than the rest, but they are all competing for it. In the end, they all discover that Gorea, an evil being that was sealed away, tricked them, and the beast acquires their weaponry. Samus manages to save Sylux, but that does not change his feelings about her.
Metroid Prime 3: Corruption
While Sylux himself does not appear, his spacecraft can be seen at the end of the game.
Metroid Prime: Federation Force
Sylux is again seen during the game's ending, forcibly hatching an infant Metroid from its egg.
Metroid Prime 4
Sylux will serve an unknown role in the upcoming fourth main Metroid Prime game.
Super Smash Bros. Brawl
Sylux appears as a trophy and a sticker, the latter of which increases any fighter's indirect attacks.
It is not known why Sylux displeases Samus despite not doing anything bad to him.
The spaceship is seen following Samus at the end of Metroid Prime 3: Corruption was previously speculated by many fans to actually belong to Sylux. This was eventually confirmed by Nintendo and that he would play a role in Metroid Prime 4.
The armor Sylux wears was actually stolen from the Galactic Federation.