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"Space Pirate encrypted data decoded."

The subject of this article is not named in-game.
The current title is from the game's internal data.

Boss Gamma (as named internally), also known as Boss Battle 2[1], is a chaotic battle theme from Metroid: Samus Returns. It is composed by Daisuke Matsuoka.


Boss Gamma plays during encounters with Gamma Metroids. It is a frantic and energetic fast-paced battle theme, with electronic instrumentation and an emphasized beat. It can be heard here: [1]

Boss Gamma appears to be an original composition, not based upon any of the songs composed by Ryoji Yoshitomi for Metroid II: Return of Samus. While this track is not confirmed to be a remix of any preexisting Metroid songs, some of its melody is reminiscent of the Parasite Queen battle theme, and its driving beats and bass line are evocative of the Security Robot B.O.X. battle theme.