Maksim Chmerkovskiy returns to the ballroom and for the first time participates as guest judge alongside Carrie Ann Inaba, Len Goodman and Bruno Tonioli on "Dancing with the Stars" first ever plugged/unplugged night. Not a stranger to expressing his strong opinion, Maksim is sure to unleash his unique brand of critique during the intense semi-final competition. The night will begin with a spectacular opening number by Emmy(R) Nominated choreographer Mandy Moore, featuring the pro dancers. The couples then must rise to a new challenge and perform to two different versions of the same song. In the first round of competition, the couples will perform either a Jazz, Paso Doble, Cha Cha or Tango routine to an original or "plugged" version of their selected song. In round two of competition, the couples will perform either a Viennese Waltz, Argentine Tango or Rumba routine to an acoustic or "unplugged" version of that same song. Special musical guests will accompany the unplugged performances including singer Kerli, who will perform a version of Fall Out Boy's "My Song Knows," and YouTube sensation Noah Guthrie who will perform his popular cover of "Sexy & I Know It." At the end of the night, one couple will face elimination.

After 10 weeks of entertaining, stylized dancing from Corbin Bleu & Karina Smirnoff, Jack Osbourne & Cheryl Burke, Bill Engvall & Emma Slater and Amber Riley & Derek Hough, only one couple will be crowned "Dancing with the Stars" Champions. These four remaining couples will have one last opportunity to impress the judges and the viewers.