Chuck is the third studio album by Canadian rock band Sum 41. The album was released on October 12, 2004. It is the band's last album to feature the full classic lineup; lead guitarist Dave Baksh left Sum 41 on May 11, 2006, to pursue his career with his own band Brown Brigade (he later returned in 2015). "Chuck" peaked at No. 2 on the Canadian Albums Chart and No. 10 on the US "Billboard" 200, making it the band's highest-charting album until it would be surpassed by "Underclass Hero" in 2007.