Operation: Doomsday is the debut solo studio by MF Doom. It was first released through Fondle 'Em Records on 19 October 1999, and 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 was released by Doom's label Metal Face Records on 24 October 2011.