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.

Morri fuses blackened thrash with the abrasive energy of crust punk, drawing on the raw aggression shared between those worlds. Their 2019 EP "Não Existe Vida," recorded at LF Studio in Realengo, announced a band with no interest in polish — just velocity, hostility, and grime.

Morthure emerged from Curitiba's underground scene with a sound anchored in the crossover zone between thrash and death metal, carrying the weight of the band's earlier existence as Overlook. Their debut album Where Everything Shall Die, an eleven-track record released independently, established their appetite for punishing riff structures and aggressive tempos.

Mortom plays a hard-hitting blend of thrash and groove metal from the city that gave the world Sepultura and Sarcófago, drawing naturally from that rich legacy of heaviness. The band released their self-titled debut EP in December 2020, a five-track statement packed with driving riffs and the kind of thick, mid-paced groove that defines the Minas Gerais metal tradition.

Munkill is an extreme metal band from San Carlos de Bariloche, Río Negro, whose founding members include vocalist/guitarist Demogorgon Malignum, bassist Malice Misanthropic, and drummer Sebastian Ortega. Their debut album "Suicide Or Homicide" was recorded at Insight Producciones and released in September 2012, followed by "Ambition and Destruction" in 2020, recorded in quarantine and mixed by Agustin Ortega at Demogorgon Malignum Producciones.

Formed by guitarist and vocalist Jean Nightbreaker, Murdeath delivered tightly wound thrash and speed metal with a NWOBHM edge across releases like the 2014 EP "Apocalipse Sangrento" and the 2016 full-length "Sob o Signo...". The Curitiba outfit announced a hiatus in late 2022 following a final show with Skull Fist in early 2023.

Mörbidez is a one-man black thrash project that recorded its entire debut, Sob o Signo de Belial, between April and May 2020 at the creator's own Casa da Bruxa studio in Vitória. The album channels the ragged energy of first-wave black metal and South American speed metal through nine Portuguese-language tracks steeped in satanic imagery, and was released in June 2020 alongside a bonus covers EP titled Limbo.