“The Enemy Inside” is the first single from progressive metal/rock band Dream Theater’s eponymous 12th studio album. It was announced on the band’s official Facebook page as the first single on August 3, 2013 and was made available by USA Today for streaming on August 5. A lyric video on YouTube for the song was published on the band’s YouTube channel a day later.
There is a music video for the song which shows a returning war veteran suffering from post-traumatic stress disorder. It is notable as Dream Theater’s first music video to not feature any of the band members.
On December 6, 2013, it was announced that “The Enemy Inside” was nominated for the “Best Metal Performance” Grammy Award. It lost to Black Sabbath’s “God Is Dead?”