Makabro is a heavy/thrash/power metal band from Villa Regina, Río Negro, formed in 2014 and active in Argentina's Patagonian underground scene. The band self-released a six-track studio EP in 2022, available on Spotify as "Full EP Estudio 2022", documenting their progressive thrash sound.

Mamut is a Buenos Aires thrash and groove metal band featuring vocalist Theo Peltzer, guitarist Facundo Robles, and bassist Gerardo Cei, known for fusing classic and modern metal with Latin American folk rhythms. The band recorded their 2023 album 3 — an eight-track release — at Romaphonic Studios in Buenos Aires in December 2022.

Manifiesto is a thrash and heavy metal band from Morón, Buenos Aires, led by guitarist Cristian González, with a catalogue that spans from their first album Insano (2006) through La Obra Maestra del Odio (2015) to La Ley del Talyon (2024). After nearly a decade between studio records, the band's 2015 comeback album was reviewed across Argentine metal media including Metal-Daze Webzine and Metal Argento, cementing their standing in the local scene.

This Belo Horizonte thrash/death metal band took their first stage alongside Chakal and Aamonhammer at the Black Death Festival in 1987, placing them among the earliest acts in the formative Brazilian extreme metal underground. The band later renamed themselves The Mist in 1988 and continued recording and performing under that name through the 1990s before eventually reviving.

Formed in Taquara in 1993, Megalon built their sound around the savage intersection of death and thrash metal, channeling science fiction themes through a battery of demos — "Hands of God" (1998) and "Gattaca" (2000) — that drew coverage in national outlets like Rock Brigade magazine. The band was also a driving organizational force behind the local Thrash Attack festival and is documented in the regional rock history documentary "As Pedras do Rio Ligeiro."

Melabstra, short for Melodía Abstracta, is a metal band from Medellín, Colombia, active since 2012. The band has built a catalogue spanning multiple releases including the debut EP Abstracción religiosa dualidad imparcial (2012), the full-length El fruto de la discordia (2020), and the album Egocentrismo (2024), with lyrics exploring themes of religion, death, and conflict.

Methrasheros is a thrash/punk crossover band from Ramos Mejía in the Buenos Aires province, featuring vocalist Pablo Methrashero, guitarists Julio Pursan and Gabi Asko, bassist/vocalist Hernan Wattusi, and drummer Leandro Lapolla. Their eleven-track album Enemigos was released on October 6, 2018, with tracks addressing political and social themes.

Metáfora were a thrash/death metal band from Sergipe whose releases included the album 'Paganini' and the later full-length 'Vincit Omnia,' both catalogued on Metal Archives. The band split up after cultivating an aggressive sound rooted in the Brazilian extreme metal tradition before dissolving.

Mitosis is a metal band from Cipolletti, Río Negro, formed in 2005 by members of the defunct Voz Natal, with a core lineup of Kiri Marchan (guitar/vocals), Milton Márquez (guitar), Toto Cufari (bass), and Agustín Barbosa (drums). They released three albums — Un motivo de existencia (2008), La razón del hoy (2011), and Alto en el fuego un imperio sanguíneo (2015, mastered by Mario Breuer) — and shared stages with Sepultura and A.N.I.M.A.L. before the band dissolved in early 2023.