New Zealand Māori metal band Alien Weaponry rose from local act to international prominence over the course of 2016–2018, lauded by critics and fans for their songs involving Māori history and culture, and with lyrics in the indigenous Māori language. This article examines Alien Weaponry's participation in Māori language revitalisation efforts and explores the use of indigenous frameworks for analysing these issues. Māori principles of kaitiakitanga (protection) and whai wāhi (participation) offer an understanding of the band's contributions to both Māori cultural preservation and global metal, and of how these contributions cooperate in the band's success. In addition to unpacking the issues of identity, indigenousness and language revitalisation inherent in understanding Alien Weaponry's output, this article also expands on previous work on nationhood and identity in both global metal music and Māori popular music.