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Theme of Samus Aran, Space Warrior is the name of a theme that appears in Super Smash Bros. Brawl and Super Smash Bros. for Nintendo 3DS and Wii U on the Norfair stage. It is a remix of the credits theme from Super Metroid. Below are links for comparison.
The original theme from Super Metroid can be heard here: 
The remix from Brawl can be heard here: 
Another version of this music can also be heard in Metroid Prime 2: Echoes, as the theme of the Federation Marines. It is also included in Metroid Prime 3: Corruption, when Samus meets Aurora Unit 242 in person after obtaining the PED Suit, and again when she speaks to Fleet Admiral Castor Dane on the Pirate Homeworld. A third remix plays on the trailers and about the game sections of Metroid.jp after its overhaul on June 3, 2010. This same remix is featured in the E3 2010 trailer for Metroid: Other M. The remix is also now playing on Metroid.com after its own overhaul.