In 1998, Zev Love X of the seminal rap group KMD re-emerged as a masked super villain known as MF Doom, released "Operation: Doomsday", created multiple aliases, then worked on collaborative side projects with Madlib and Dangerdoom with Danger Mouse. This long awaited follow-up to "Operation: Doomsday" was originally released in late 2004 and has since been out of print.