Underneath his mysterious metal mask, MF DOOM hides the cachet underground legends are made of.  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. Decades later, MF DOOM is still celebrated for all facets of his work and influence. In the face of tragedy, DOOM re-infiltrated the rap game on his own terms, and crafted an instant cult classic.