Zero Suit Samus

Zero Suit Samus is an alternate form of Samus that can be triggered by her Final Smash in Super Smash Bros. Brawl. She can also be selected at the start of a match by pressing a shield button on the character selection screen. During battle, Samus can become Zero Suit Samus any time by quickly performing the Taunts ↑↓↑.

When Samus finishes her Final Smash, the Zero Laser, the force of the beam is so strong it causes the Power Suit to fall off, which was seen in the E3 Trailer. Once this happens, she turns into Zero Suit Samus. Now, she is easier to KO. Players can even pick up and throw her dropped armor, which now act similarly to items. Zero Suit Samus is, however, more swift and agile than her armored counterpart. She can now also use a gun that transforms into an energy whip. Her whip will also have a similar function as Link's hookshot. Zero Suit Samus will be voiced by Alesia Glidewell, who will also be voicing Knuckle Joe in Super Smash Bros. Brawl.

Zero Suit Samus
''Samus Aran without her mighty Power Suit. In this condition, she does not have the firepower she's famed for but is in full possession of the agility and athleticism she gained through her childhood training with the Chozo. Without the armor, she's also much, much faster. The weapon she carries is a self-protection device known as a Paralyzer that stops enemies cold.''

Zero Suit Samus (Final Smash)
''Zero Suit Samus's Final Smash. Samus loses her Power Suit when she fires the Zero Laser, but she can restore it--that is, she can return from her Zero Suit form to her familiar armored form. That being said, Zero Suit Samus is very quick with great reach, so there are tactical reasons to fight as is. If that's your preference, don't pick up any Smash Balls.''