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Mario Lopez and the Broadway cast of A Chorus Line will appear on the Tuesday, May 6 edition of ABC's hit reality show Dancing With the Stars. Lopez, who plays Zach, and the company will perform a version of the musical's opening number and its famous finale, "One."

The show will mark Dancing's 100th episode, and will feature guest appearances by the country band Rascal Flatts, as well as such former contestants as Apolo Anton Ohno, Mel B. Sabrina Bryan, Joey Fatone, Jane Seymour, Jerry Springer, and Wayne Newton.

This year's competition is down to its final five pairs, including Tony Award winner Marissa Jaret Winokur, NFL star Jason Taylor, R&B star Mario, Olympic figure skater Kristi Yamaguchi, and Spanish television star Christian de la Fuente, who injured his arm on Monday night's episode.