Masterhead are a three-piece thrash metal outfit from the Fortaleza metropolitan area whose sound draws heavily from the Bay Area tradition, with Francisco "Mustaine" Alves handling both guitar and vocals alongside Denilson Andrade and John Nascimento. They built their catalog through the 2008 demo Enemy of Time and the 2017 EP Waiting Terror, later releasing the single Metal Warrior in 2021.

Matarte is a three-piece metal band from Punta Alta, Buenos Aires, Argentina, formed around 2013, consisting of vocalist Ulises Kaliléc, guitarist/bassist Jonathan Bazan, and drummer Agnatne Ajeivut. The band released their album "Sangra Maldad Eterna" on June 6, 2020, a ten-track record recorded, mixed, and mastered at Tumumu Untungu Home Studio in Punta Alta. Their sound blends melodic death and thrash metal with occult lyrical themes, as heard on tracks like "Dioses Muertos" and "Sacrificio Infernal".

Matricidium plays straight-ahead thrash metal rooted in the aggressive tradition of early Brazilian and US thrash, releasing their debut album 'Rise the Army' in 2012 through MS Metal Records and following it with an expanded European edition in 2014. In October 2015 the band completed their first European tour across nine countries, playing 15 shows in 23 days and establishing themselves beyond the domestic circuit.

Maverick channel groove-heavy riffing through a thrash and metalcore lens, with socially charged lyrics that address dehumanization and internal conflict. The band built a steady catalog including "Quid Pro Quo" (2014), "Cold Star Dancer" (2018), "Ethereality" (2021), and "Silver Tongue" (2024), demonstrating consistent growth in both production and songwriting since their founding by vocalist/guitarist Gabriel Sernaglia and drummer Gustavo Polississo.

Maze of Madness play straightforward heavy and thrash metal with a raw, stripped-back energy, releasing their debut album "Mass Hatred" in July 2022 shortly after forming. The eight-track record plants the band firmly in the tradition of classic thrash aggression without straying far from the genre's foundational template.

Mazemath is a thrash and death metal band from Santiago, Chile, formed in 2015. Their debut album The Illusion of Freedom, released in 2016 and recorded at AudioCustom Studios in Santiago, introduced the band's aggressive approach to politically and cosmically charged lyrical themes including environmental destruction and political corruption.

Mecanica was a thrash metal band from Morón, Buenos Aires, Argentina, formed around guitarist Jorge Moreno alongside vocalist Diego Leguizamón, guitarist Nicolás D'Cristófaro, bassist Luis "Bicho" Medina, and drummer Diego Nuñez. The band recorded their debut album "Códigos de Barrio" between April and August 2018 at Kirkincho Records in Morón, releasing it through Icarus Music in 2019. The nine-track record showcases old-school Argentine thrash, closing with the signature track "Violencia Es Thrash".

A thrash metal outfit from the capital whose self-titled debut was released in 2008 through Thrash Massacre Records as a limited run of 500 copies. Their sound draws on the classic Brazilian and North American thrash traditions, delivering the kind of high-energy, riff-driven attack that the genre demands.

Mediadhor hit the ground running with two releases in quick succession: the demo "Caminho do Arrependimento" in late 2016 and the full-length "Campos Mortais" in early 2017. Their approach fuses the grinding aggression of death metal with thrash's rhythmic momentum, giving the material a relentless, forward-charging quality.