Mentallo and the Fixer is the project name used by Texan electro-industrial musicians Gary Dassing (Mentallo) and Dwayne Dassing from 1988 to 1999, and by Gary Dassing alone from 1999 to the present day. The band has several releases on the American record label, Metropolis Records. They are named after two Marvel Comics characters.

Electro-industrial is a music genre that emerged from industrial music in the early 1980s. While EBM has a minimal structure and clean production, electro-industrial tends to have a grittier, complex and layered sound with a more experimental approach. The style was pioneered by Skinny Puppy, Front Line Assembly, Numb, and other groups, either from Canada or the Benelux. In the early 1990s, the style spawned the dark electro genre, and in the mid-/late-1990s, the aggrotech offshoot. The fan base for the style is linked to the rivethead subculture.