"Countdown to Extinction" is a 1992 album by the American heavy metal band Megadeth. The album features a mix of thrash metal and more melodic elements, showcasing the band's evolution in sound. It addresses themes such as environmental issues, war, and social justice, reflecting the band's concerns about the state of the world. The title track, "Countdown to Extinction," critiques humanity's impact on the planet and the extinction of various species. The album received positive reviews and is considered one of Megadeth's most significant works, contributing to their legacy in the heavy metal genre.