The 1999 release of Operation: Doomsday marked MF DOOM’s official debut, reintroducing a mysterious figure who would soon become one of underground rap’s greatest voices. Within its 19 tracks, Operation: Doomsday reveals the confluence of DOOM’s tragic past, personal interests and daring creativity. His clever rhymes and remarkable schemes stood out against the landscape, and every sound he touched — from cartoon theme songs, to ‘80s soul, to rap classics and more — got reinterpreted into something brand new and surreal.