Passage: While on his Lock Up the Wolves U.S. tour in August 1990, former Sabbath vocalist Ronnie James Dio was joined onstage at the Roy Wilkins Auditorium by Geezer Butler to perform "Neon Knights". Following the show, the two expressed interest in rejoining Sabbath. Butler convinced Iommi, who in turn broke up the current lineup, dismissing vocalist Tony Martin and bassist Neil Murray. "I do regret that in a lot of ways," Iommi said. "We were at a good point then. We decided to [reunite with Dio] and I don't even know why, really. There's the financial aspect, but that wasn't it. I seemed to think maybe we could recapture something we had."Dio and Butler joined Iommi and Cozy Powell in autumn 1990 to begin the next Sabbath release. While rehearsing in November, Powell suffered a broken hip when his horse died and fell on the drummer's legs. Unable to complete the album, Powell was replaced by former drummer Vinny Appice, reuniting the Mob Rules lineup, and the band entered the studio with producer Reinhold Mack. The year-long recording was plagued with problems, primarily stemming from writing tension between Iommi and Dio. Songs were rewritten multiple times. "It was just hard work," Iommi said. "We took too long on it, that album cost us a million dollars, which is bloody ridiculous." Dio recalled the album as difficult, but worth the effort: "It was something we had to really wring out of ourselves, but I think that's why it works. Sometimes you need that kind of tension, or else you end up making the Christmas album".The resulting Dehumanizer was released on 22 June 1992. In the U.S., the album was released on 30 June 1992 by Reprise Records, as Dio and his namesake band were still under contract to the label at the time. While the album received mixed reviews,, it was the band's biggest commercial success in a decade. Anchored by the top 40 rock radio single "TV Crimes", the album peaked at number 44 on the Billboard 200. The album also featured "Time Machine", a version of which had been recorded for the 1992...

Question: Who did Iommi and others decided to reunite with?
Dio