z²

Z² (short for Ziltoid 2; pronounced "zed squared" or alternatively "zee two") is a double album by Canadian musician Devin Townsend and his musical project Devin Townsend Project, released on October 27, 2014. It consists of two albums released together: the sixth album in the Devin Townsend Project series, the rock-oriented Sky Blue, and Dark Matters, a solo metal concept album acting as a sequel to Townsend's 2007 album Ziltoid the Omniscient. The main theme of Dark Matters is, according to Townsend, "Ziltoid against the world". In 2024, it was named one of the 10 "wackiest" progressive metal albums ever by Loudwire.