Frequency Unknown

Frequency Unknown is a studio album released under the name Queensrÿche; it was released by Geoff Tate's temporary version of the band, before a settlement determined that only the other band members were entitled to use the name Queensrÿche. The album was released on Cleopatra Records' sub label, Deadline Music, on April 23, 2013, as music download, on CD and limited edition vinyl LP in the United States and on May 21, 2013, as audio cassette which excludes the re-recorded classics, and on June 3, 2013, on CD in the United Kingdom.

It was co-written, and originally produced and mixed by Jason Slater, who has previously also produced Queensrÿche's albums Operation: Mindcrime II (2006), American Soldier (2009) and Dedicated to Chaos (2011). Frequency Unknown is Queensrÿche's last album to be produced by Slater, and was the final album he produced prior to his death in 2020.

It was revealed to the public on April 28, 2014, that Geoff Tate lost the rights to the Queensrÿche trademark. After the settlement was announced, Tate changed the name of his version of Queensrÿche to Operation: Mindcrime.