Get a full dance-by-dance recap of this week's 'Dancing With The Stars'
Chmerkovskiy will join the regular trio of judges - Carrie Ann Inaba, Len Goodman and Bruno Tonioli.
He has not competed for the past several seasons, but the outspoken dancer is sure to bring his unique brand of critique during the intense semi-final competition on Monday, Nov. 18.
The episode will feature the show's first-ever "plugged/unplugged" night. The couples will have to perform two different versions of the same song.
In the first round, the couples will perform either a Jazz, Paso Doble, Cha Cha or Tango routine to the original "plugged" version of their selected song. In the second round, the couples will perform either a Viennese Waltz, Argentine Tango or Rumba routine to an acoustic or "unplugged" version of that same song.
One couple will face elimination at the end of the night.
See photos from all the action in Week 9 of 'Dancing With The Stars'