Infinite Wisdom are a crossover thrash and hardcore band from Brighton, England, formed in 2020. They channel aggressive crossover energy with hardcore punk intensity.

Inglorious Castar is a thrash metal/crossover quartet from Brussels, Belgium, formed in 2018, featuring Dave on bass and lead vocals, Phil on lead guitar, Djé on drums, and Mr Çois on guitar. Since their 2018 demo, the band has released Bring Out Your Dead, combining breakneck thrash riffing with crossover punk attitude.

Inherit are a crossover/thrash metal band from London, formed in 2020. They deliver fast, aggressive crossover thrash from the UK capital.

Inhuman Conditions is a thrash metal/crossover band from Bochum, Germany, formed in 2021, fusing the velocity of thrash metal with the raw energy of hardcore punk. The band delivers crossover aggression from the heart of the Ruhr industrial region.

Inhuman Nature are a thrash metal, crossover, and hardcore band from London, formed in 2017. They have performed at major festivals including Bloodstock and Summer Breeze, establishing themselves as one of the UK's rising thrash and hardcore acts.

Thrash metal/crossover band from France active since 2016. Their sound fuses thrash speed with hardcore punk crossover energy.

Insanity Alert are a crossover thrash band from Innsbruck who launched in 2011 and quickly became a fixture on major European festival bills including Hellfest and Brutal Assault, signed to Season of Mist. Citing S.O.D., D.R.I., Suicidal Tendencies, and Municipal Waste as primary influences, the band pairs frenetic 80s-styled thrash with a beer-soaked sense of humor, epitomized by the 2024 covers record Moshemian Thrashody.

Insurgência is a thrash metal/crossover band from Amadora, Portugal, active since 2024 and fusing the aggression of thrash metal with hardcore punk's raw energy and attitude. The project delivers high-octane crossover fury.

Internal Excavation is a death/thrash metal/crossover band from Budapest, Hungary, active since 2013 and merging death metal's heaviness with thrash's relentless velocity. The project delivers aggressive crossover fury.