Formed in Santos with a founding lineup of Marcus Vinicius on vocals, Fausto Pietro on drums, and Vinicius Guedes on guitar, Metallstein draw on old-school death metal, speed/thrash, and grindcore for a raw and uncompromising sound. The band released their self-titled debut single containing six tracks in early 2023 and have since appeared on the 'Workingclass In Roll – Brazilian Compilation' with the track 'Sonho Súbito'.

Originally formed as Metalmad in 2012 in Mogi Guaçú, the duo of Alexandre Quadros on vocals and Alex Roque on guitar and bass relaunched as MetalMad DC with a heavier, more aggressive identity. Their Portuguese-language output spans thrash, crossover, and hardcore-tinged territory, documented across singles including 'Olhos de Medusa', 'Chinelada', and 'Depois do Coma', the last of which earned a 7/10 review from Roadie Crew.

Metalriff is a Santiago thrash metal band founded in 2017 by guitarist and vocalist Leonel Contreras, who built the project around politically charged songwriting and an increasingly refined technical approach. The band released the EP Pray or Die in 2017, the full-length Blinded in 2018, and the Australis Records-backed Under My Skin in 2020, recorded at Estudio Cordovez Productions in Santiago.

Metastasis is a death/thrash metal band from Quilpué, Valparaíso, Chile, formed in 2006 by Gabriel Quinteros and Eduardo Madariaga, whose name was suggested by a friend who had battled cancer as a reflection of the band's death-themed subject matter. Their discography spans the 2011 compilation From the Snow the Executioner Rises Again (Suffering Jesus Production), the 2014 full-length The Essence That Precedes Death, and the 2024 album Fatal Morphosis, recorded at Vardager Records in Quilpué.

Methal Kyrios is a thrash metal band from Santa Rosa, La Pampa, Argentina, formed by guitarist Santiago Robles, bassist/vocalist Mauro Queupul, and drummer Federico Montero. They have released two full-length albums — Disipando Tinieblas (2018) and Síndrome Oscuro (2021) — and were working on a third record titled ULTRA as of early 2026.

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.

One of Rio de Janeiro's earliest thrash metal outfits, Metralion emerged in 1986 with sharp socially critical lyrics and released their debut album Quo Vadis in 1988, followed by the EP A Mosh in Brazil in 1989. After a long dormancy, both early records were reissued on CD by China's Awakening Records in 2019, reigniting interest that led to the comeback full-length Requiem for a Society in 2021.

Metralleta is a heavy/groove metal band from Larroque, Entre Ríos, a small city in eastern Argentina seldom represented in the local metal scene. Their recorded output includes the 2009 album Todo o Nada and the follow-up Puente, released on August 1, 2014, which features tracks such as "Cuando los muertos viven," "Vértigo," and "Victoria."

Metralleta is a heavy/groove metal band from Larroque, Entre Ríos, a small city in eastern Argentina seldom represented in the local metal scene. Their recorded output includes the 2009 album Todo o Nada and the follow-up Puente, released on August 1, 2014, which features tracks such as "Cuando los muertos viven," "Vértigo," and "Victoria."