Operation: Doomsday is the debut solo studio album by Daniel Dumile, and the first under the MF Doom moniker. It was first released through Fondle 'Em Records on 19 October 1999, and later reissued by Sub Verse Records in 2001 with a slightly altered track listing. It was his first solo release under the MF Doom moniker after previously performing as Zev Love X in the group KMD. Operation: Doomsday is regarded as one of the most influential albums in independent hip-hop history. A deluxe remastered version of the album was released by Doom's own Metal Face Records on 24 October 2011.