Ironbound is a crossover thrash metal band from Alagoinhas, Bahia, Brazil, featuring vocalist Angello, guitarist Kenion, bassist André, and drummer Raul. The band released several EPs including "Máquina da Morte" and "Possuídos Pelo Thrash," delivering aggressive Portuguese-language thrash rooted in the tradition of classic Brazilian extreme metal. They returned to activity in 2018 after a period of inactivity, continuing to represent the underground thrash scene of northeastern Brazil.

Irreverencia is a speed/thrash metal band from Santiago, Chile, active since 1995, whose lyrics address atheism and political themes. Their 2001 album Dadme la otra mejilla stands as a key release in their catalogue, and the band has remained active through releases on Santiago's Bolchevique Records.

Irritator was a thrash metal band from São Paulo, Brazil, formed in 2020 with a lineup of Renato Castro on vocals, Matheus Fortunato and Eduardo Covello on guitars, Rafael Savone on bass, and Lucas Prado on drums. The band recorded a self-titled demo featuring five tracks sung entirely in Portuguese, addressing themes of social chaos, political corruption, and inequality — drawing sonic comparisons to Sepultura and Pantera. Praised by Brazilian metal media outlet Whiplash.Net for their maturity and conviction, the band has since split up.

Isen Son is a heavy and thrash metal band from Maringá, Paraná, Brazil, drawing influences from heavy, doom, and thrash metal traditions. The band recorded their debut EP "Evil" in December 2022 in Maringá, releasing it in February 2024 through Metal Archives and SoundCloud. They represent the growing underground metal movement in Brazil's interior, away from the better-known scenes of São Paulo and Belo Horizonte.