Dark Samus (ダークサムス, Dark Samus) is a character from the Metroid series, specifically the Metroid Prime games.
When Samus Aran defeated the titular creature of Metroid Prime, it took one last grasp at Samus that stole her Phazon Suit before it dissolved into a pool of Phazon. After Samus was forced to leave by the collapse of the area, Metroid Prime absorbed itself into the Phazon Suit, which caused it to merge with the suit and transform it into a living being. The new creature is a Phazon-based lifeform composed of both Metroid Prime remnants and parts of Samus's DNA that were stolen along with the Phazon Suit.
Dark Samus is first seen by the Space Pirates in Metroid Prime 2: Echoes. They first believe she is Samus with a new suit and new goals, as she only steals Phazon the pirates are mining on Aether for her own sustenance. Her actions later result in the pirates' operation being discovered, leading to Samus's eventual arrival. Dark Samus fights Samus several times across Aether, prompting the pirates to consider an alliance with her, though this never occurs. Once Samus defeats the Ing and destroys Dark Aether, Dark Samus confronts her for the last time, but appears to disintegrate after losing.
After her defeat, to begin Metroid Prime 3: Corruption, Dark Samus's remains are unknowingly collected by the Space Pirates as they clean up their Phazon mining operation, allowing her to reform. She absorbs all Phazon aboard the ship and corrupts the few pirates she leaves alive into serving her, before setting off towards her new goal: galactic conquest via the spread of Phazon across planets. Using the brainwashed pirates and a captured Federation ship's organic supercomputer, she takes control of planet Phaaze, the source of all Phazon, and attacks key Federation planets with Phazon-infused Leviathans that will in time corrupt them into Phazon-based planets. Samus manages to stop one of the destructive meteors, but Dark Samus arrives to infect her and three other hunters with Phazon. The other hunters all fall under Dark Samus's control, forcing Samus to kill them in turn, before eventually arriving to Phaaze and confronting Dark Samus for what appears to be the last time.
As a combination of Samus's suit and DNA, Dark Samus possesses all of her abilities, many of which are Phazon-enhanced. She is shown as intelligent and manipulative, obsessed with absorbing and spreading Phazon and transforming the host planet's random seeding into a directed spread of the substance.
Dark Samus appears as a trophy and as a sticker. Additionally, a "Dark Samus" appears in Co-Op Event 7: Battle of the Dark Sides, though it is merely a blackened version of Samus and not the actual Dark Samus. It teams up with Dark Link against the two players that plays as their light counterparts, Link as player one and Samus as player two.
The description is not entirely accurate; if the player achieves 100% completion in Metroid Prime, a cutscene plays that strongly suggests Metroid Prime being reborn into Samus's stolen Phazon Suit. However, this fact is unknown in-universe, as demonstrated by various pieces of lore in subsequent games.
As an Assist Trophy
Dark Samus appears in her design from Metroid Prime 3: Corruption. Some of her attack animations are similar to Samus's, such as her down tilt and up smash. She hops around with long jumps, attacking with three different moves:
Before leaving, she poses with her Arm Cannon in front of her face. Like several other Assist Trophies, she can be defeated if she takes enough hits, where she will leave by fading out in a bright blue flash.
Dark Samus's color scheme is also the basis of one of Samus's alternate colors. In an event match, this color scheme is used to simulate Samus battling Dark Samus. Similarly, the color scheme appears in a co-op event match that features several playable antagonists as opponents.
As a playable character
Main article: Dark Samus (SSBU)
Dark Samus was confirmed to appear in Super Smash Bros. Ultimate as a playable character on August 8, 2018 during the first Ultimate-centric Direct. She is an Echo Fighter of Samus, and is virtually identical in function - besides a few changes as a result of her aesthetic design.
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