Bands that turned into supergroups due to line up changes

Recently I've been reading Ult's reviews for Rainbow's Down to Earth and Whitesnake's Slip of the Tongue, and in both of them he mentions that the respective bands were supergroups around the time they released those albums, so I've been thinking about other bands that were eventually joined by (relatively) well known musicians from other bands.
Some examples off the top of my head:

Death cca. Individual Thought Patterns - along with bandleader Chuck Schuldiner, the band also included Sadus bassist Steve Di Giorgio, King Diamond guitarist Andy La Rocque and Dark Angel drummer Gene Hoglan; a case could also be made for Human era Death when Masvidal and Reinert of Cynic were in the band, but that was before Cynic recorded Focus so I wouldn't really count it

Testament cca. The Gathering - along with founding members Chuck and Eric, the band also consisted of guitarist James Murphy of Death, Obituary and Cancer fame, drummer Dave Lombardo of Slayer and, again, Steve DiGiorgio of Sadus & Death

Slayer - the current line up with guitarist Gary Holt of Exodus and drummer Paul Bostaph of Forbidden/Testament/Exodus

Fates Warning - also their current line up, with bassist Joey Vera of Armored Saint and veteran drummer Bobby Jarzombek, who also played with Riot and Iced Earth, among others

Stratovarius - the period when both keyboardist Jens Johansson and drummer Jörg Michael were in the band, as well as the short period when Jörg was replaced by Jens's brother Anders

several incarnations of Black Sabbath, most notably '83-'84 with Deep Purple vocalist Ian Gillan and ELO drummer Bev Bevan, and '89-'91 and again '94 - '95 with former Whitesnake members Neil Murray and Cozy Powell

Any other bands that come to mind?

The current lineup of Ratt fits that category, with Carlos Cavazo on guitar and Jimmy DeGrasso on drums.

The final lineup of Dio could be called a supergroup. Rudy Sarzo, Craig Goldy, Ronnie James Dio, Scott Warren and Simon Wright.

King Crimson at least a couple of times, specifically the line-ups comprising Robert Fripp, John Wetton, and Bill Bruford; and then Fripp, Bruford, Adrian Belew, and Tony Levin.

And Dream Theater perhaps? Jordan Rudess and Mike Mangini were both established names before joining.