Ozzy Osbourne will come out of touring retirement and reunite with the full Black Sabbath lineup for the first time in 20 years.

Black Sabbath has announced the 'final' show by its original lineup, a benefit titled 'Back to the Beginning' with Metallica, Slayer and others.

The concert, titled Back to the Beginning, will mark the first time the original four members of Black Sabbath — Ozzy Osbourne, Tony Iommi, Geezer Butler and Bill Ward — will perform together in 20 years. A plethora of other huge rock and metal musicians, including Metallica, Slayer, Alice in Chains, Anthrax and more will also play at the event.