This is what we found on Wikipedia regarding the The Mark of Cain:

The Mark of Cain (also seen as the initialism TMOC) are an alternative metal band from Adelaide, South Australia. Their style has been likened to that of Helmet and Rollins Band, yet this band pre-dates both groups and was influenced by the early work of Joy Division, Big Black and United States hardcore groups.

The Mark of Cain were formed in mid-1984 by siblings Josie (formerly John) (guitar) and Kim Scott (bass guitar), with Rod Archer on vocals and Gavin Atchison playing drums. In 1985, Archer left the group. Josie Scott took on the lead vocal role and the group has remained a trio ever since. The Scotts have been the core of the band, which has featured ten different drummers. Since January 2001, former Helmet member John Stanier has been their drummer; he is also concurrently with Tomahawk and Battles.

Australian musicologist Ian McFarlane has described the group's sound as "Gloomy, monotonous vocals and bleak slabs of metallic guitar [doing] battle over a lurching rhythm section to arrive at a harsh sound." He also wrote that "the band's penchant for militaristic imagery and lyric themes (to say nothing of the members' close-cropped, marine-styled looks) only added to the sense of desperation and solitude displayed in the band's music."

Throughout the 1990s Australian concert goers saw the emergence of bands that challenged the status quo. Major label influence was challenged by the rise of so-called "Alternative" bands. The likes of Big Black, Shellac, Helmet, the Jesus Lizard and Rollins Band were gaining fans in Australia. Many were surprised to learn that among these overseas musicians were fans of an Adelaide band: The Mark of Cain.

Guest programmers on ABC TV’s ‘Rage’ like Henry Rollins, Lydia Lunch and Sepultura played the "Battlesick" music video. Rollins praised the band, saying there were bands in the USA that were trying to play 'that kind' of music, but were years behind TMOC. Rollins went on to produce Ill At Ease, the band's most popular album to date.

2019 marked the 30th Anniversary of the release of the Battlesick album. A national tour took place in October, and the album was re-released on vinyl. Eli Green played drums on the tour.

In 2020, the band celebrated 25 years since the release of Ill At Ease, but tour plans were interrupted by the COVID-19 pandemic. In 2022, the 'A Different Kind Of Tension Tour' was announced, starting in August with two shows in Adelaide coinciding with the band's induction into the South Australian Music Association’s Hall of Fame,. The band also played dates in Melbourne, Sydney, Perth, the Gold Coast and Brisbane. The band played the Ill At Ease songs on tour in 2023–24.