Underclass Hero

Underclass Hero is the fourth studio album by the Canadian band Sum 41. It is the first album by the band not to feature former guitarist Dave Baksh since he left a year early to focus on Brown Brigade and is also the first recorded as a trio. The album was first released July 18, 2007 in Japan. It was released under the Island Records label and distributed worldwide by Universal Records, by Aquarius Records. The album cover features a photo with singer Deryck Whibley spitting. This album features more alternative rock songs than their previous albums. The album's lyrics have been described as more mature and personal than in some of the band's previous records. It was written as a concept album focusing on lead vocalist Deryck Whibley's outlook on life, covering subjects such as politics, atheism and family life. The album has more of a pop punk sound in comparison to the alternative metal style of their last album, Chuck.

The album was a commercial success, peaking at number 1 on the Canadian Albums Chart and at number 7 on the U.S. Billboard 200. It received generally mixed reviews from critics, with some critics praising its mature subject matter and style, while others criticized it for being unoriginal. The album would become the band's last release for four years until 2011's Screaming Bloody Murder. It is also Sum 41's last release on Aquarius.