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Season 7: Michael Flatley takes Len Goodman's spot as Lord of the Dance
The Lord of the Dance himself made an appearance on "Dancing With the Stars" when he sat in as a guest judge for Len Goodman. Goodman reportedly had an "impossible schedule," and Michael Flatley was happy to take his spot. Flatley later returned to "DWTS" with a troupe of male dancers to perform on the show.