Black Sabbath has scrapped many of its upcoming European tour dates due to Tony Iommi’s ongoing battle with lymphoma, according to an issued press release. Instead, the reunited outfit will perform just one show this summer — their headlining appearance at this year’s Download Festival – while a majority of other shows will now feature “Ozzy and Friends.”

For these shows, frontman Ozzy Osbourne will be joined by Black Sabbath’s Geezer Butler and longtime collaborator Zakk Wylde. In addition, Slash and other “special guests” will appear at select dates. Check out the tour’s schedule below.

Despite the news, Black Sabbath — currently sans Bill Ward — remain at work on their first studio album in 33 years. They also plan to announce new tour dates soon.

Black Sabbath 2012 Tour Dates:
05/18 – Moscow, RU @  Olimpiski
05/20 – St. Petersburg, RU @ New Arena
05/21 – St. Petersburg, RU @ New Arena
05/23 – Helsinki, FI @ Hartwall Arena
05/25 – Stockholm, SE @ Stadium
05/26 – Jelling, DK @ Jelling Music Festival
05/29 – Bergen, NO @ Bergen Calling
05/31 – Oslo, NO @ Spektrum
06/02 – Malmo, SE @ Malmo Stadium
06/04 – Dortmund, DE @ Westfalenhalle
06/06 – Prague, CZ @ O2 Arena
06/10 – Leicestershire, UK @ Download Festival
06/12 – Rotterdam, NL @ Ahoy
06/15 – Bilbao, ES @ Azkena Rock Festival
06/17 – Nantes, FR @ Hellfest
06/19 – Paris, FR @ Bercy
06/22 – Dessel, BE @ Graspop Metal Meeting
06/24 – Milan, IT @ Gods of Metal
06/26 – Vienna, AT @ Wiener Stadthalle
06/28 – Belgrade, RS @ Usce Park
07/01 – Athens, GR @ Rockwave Festival

Ozzy and Friends 2012 Tour Dates:
05/23 – Helsinki, FI @ Hartwall Arena
05/25 – Stockholm, SE @ Stadium
05/27 – Jelling, DK @ Jelling Music Festival
05/29 – Bergen, NO @ Bergen Calling
05/31 – Oslo, NO @ Spektrum
06/02 – Malmo, SE @ Malmo Stadium
06/04 – Dortmund, DE @ Westfalenhalle
06/06 – Prague, CZ @ O2 Arena
06/15 – Bilbao, ES @ Azkena Rock Festival
06/17 – Nantes, FR @ Hellfest
06/19 – Paris, FR @ Bercy
06/22 – Dessel, BE @ Graspop Metal Meeting
06/24 – Milan, IT @ Gods of Metal
06/26 – Vienna, AT @ Wiener Stadthalle
06/28 – Belgrade, RS @ Usce Park
07/01 – Athens, GR @ Rockwave Festival