Sadus is a thrash and death metal band from Antioch, California, formed in 1984 by vocalist Darren Travis, guitarist Rob Moore, bassist Steve Di Giorgio, and drummer Jon Allen. Known for blending technical thrash with death metal aggression, the band debuted with Illusions (later reissued as Chemical Exposure) in 1988 and built a cult following through albums such as Swallowed in Black and A Vision of Misery. Bassist Steve Di Giorgio, who also played with Death and Testament, became one of the most celebrated technical metal bassists of his generation, and the band returned in 2023 with The Shadow Inside, their first new record in over two decades.

San Diego's Santa Claus have been weaponizing crossover thrash since 2014 with gleeful disregard for seasonal associations — their name a provocation, their music the delivery system. The band channels the West Coast's crossover tradition into fast, funny, and legitimately hard-hitting thrash that doesn't sacrifice aggression for the joke.

Oakland, California's Saviours have been one of the Bay Area's most reliably heavy bands since 2005, fusing the fuzzed-out weight of stoner metal with the aggressive propulsion of thrash and the melodic confidence of classic heavy metal. Their records feel like desert highway riffs played at combat speed — sun-baked, riff-driven, and deeply indebted to the California heavy music tradition.

Los Angeles's Sebek — named for the ancient Egyptian crocodile deity — forge a blackened thrash attack that's as feral and aggressive as their namesake. Active since 2015, the band channels the raw, speed-obsessed chaos of early black/thrash into something that feels genuinely dangerous rather than merely nostalgic. Their LA origins ground them in a city with deep extreme metal roots, and they honor that lineage without sounding derivative.

Los Angeles crossover outfit Septik Onslaught have been tearing up the Southern California scene since 2017, fusing hardcore aggression with the breakneck riffing of thrash metal. Their sound sits in the classic crossover tradition — short, mean songs built for pits and chaos — with a modern edge drawn from the city's diverse extreme music community. They remain one of LA's most energetic live acts in the crossover/thrash lane.

San Diego's Sergulath fuse orchestral grandeur with the raw edge of black and thrash metal, building a symphonic black/thrash sound that sets them apart in Southern California's scene since their 2018 formation.

Formed in 2025 out of Gilroy, California, Serpent and the Sun drive a groove-heavy thrash metal sound rooted in riff-forward aggression and thick rhythmic punch — a brand-new presence in the Bay Area's deep-rooted thrash tradition.

Los Angeles death/thrash outfit Serpentance formed in 2019 and channel the old-school ferocity of both genres — tightly wound riffs, barked vocals, and the kind of no-frills brutality that keeps the Southern California underground honest.

Out of Arbuckle in rural Northern California, Serpentera have been delivering death/thrash metal since 2018 — a two-genre hybrid that puts the pedal down on aggression and channels the raw energy of both traditions into a compact, punishing sound.