Operation: Mindcrime II is the ninth studio album by American progressive metal band Queensrÿche, released internationally on March 31, 2006, and in the United States on April 4, 2006. It was the band's first album to be produced by Jason Slater. It is a concept album and the sequel to the group's third studio album, Operation: Mindcrime. The album resumes the story of Mindcrime, which is that of Nikki, a drug-addicted political revolutionary who had worked as an assassin before his disillusionment and arrest. Nikki had been jailed for the murder of prostitute-turned-nun Sister Mary at the end of Mindcrime, with his sanity slipping as he genuinely didn't know who had killed Mary and had grown close to her before her death. As Mindcrime II begins, eighteen years later, Nikki is released from prison and begins to plot his revenge against Dr. X, a manipulative demagogue from the first album that had treated Nikki as his puppet. Vocalist Pamela Moore reprises her role as Sister Mary for the album. The role of Dr. X went to famous heavy metal singer Ronnie James Dio. Singer Geoff Tate handles the vocals for the protagonist. From Wikipedia (https://en.wikipedia.org/wiki/Operati...) under Creative Commons Attribution CC-BY-SA 3.0 (https://creativecommons.org/licenses/...)