The qualifiers continue with the competition turned on its head as Jennifer Lopez, Derek Hough and Ne-Yo surprise contestants who must first perform in a stripped-down warehouse to prove they have what it takes to move forward in the competition.

The qualifiers continue with the competition turned on its head as Jennifer Lopez, Derek Hough and Ne-Yo surprise contestants, who must first perform in a stripped-down warehouse to prove they have what it takes to move forward in the competition.

The qualifiers continue with the competition turned on its head as Jennifer Lopez, Derek Hough and Ne-Yo surprise contestants, who must first perform in a stripped-down warehouse to prove they have what it takes to move forward in the competition.

Select acts have one last chance to showcase their artistry and athleticism to earn a spot in the duels, where they'll battle for their right to perform on the "World of Dance" stage for the $1 million grand prize.

The duels begin, and the judges have picked which acts go head-to-head in epic dance battles for a spot in the semifinals; guest judge tWitch decides which acts battle in Redemption to earn a spot in the semifinals on the "World of Dance" stage.

The Duels" round continues with judges Jennifer Lopez, Derek Hough, NE-YO and special guest judge dancer and choreographer tWitch. This season, the judges have chosen which acts go head-to-head and acts won't know their opponent until they hit the dance floor, leading to some of the most epic dance battles the series has ever seen.

The Duels continue, and the judges have chosen which acts go head-to-head in epic dance battles for a spot in the semifinals. Guest judge tWitch decides which acts battle in Redemption.

The duels conclude with the judges having picked which acts go head-to-head in epic dance battles for a spot in the semi-finals; guest judge tWitch decides which acts will battle in redemption and earn a spot in the semi-finals on the stage.

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The final six of the top 12 acts take to the World of Dance stage for the first time; the judges score each performance based on artistry, technique, choreography, creativity and presentation; the top two scoring acts move on to the world final.

In the season four finale of "World of Dance," the top four acts take the stage for the last time in the "World Final" with judges Jennifer Lopez, Derek Hough, NE-YO and host Scott Evans. Competing for the title of Best in the World, the judges will score their performances based on their artistry, technique, choreography, creativity and presentation.