"Animal I Have Become" is the first single from Three Days Grace's second studio album, One-X. Unlike most singles, it was not released in stores, and only had one track. The song is featured on the video game WWE SmackDown vs. Raw 2007, and song stayed on US mainstream rock for 7 weeks at No. 1 and 2 weeks at No. 1 on the modern rock chart. Adam Gontier has stated that while addicted to the painkiller OxyContin, he had become abusive and angry and had no idea who he was anymore.