Julianne Hough returns to the show as a forth judge and four new pros join the cast. But the new quirky stars steal the show.

Smokey Robinson performs; a couple is eliminated.

The couples perform a variety of dances, including the cha cha, the rumba, and the foxtrot, for the judges.

A couple is eliminated; Sia performs as Maddie Ziegler and Allison Holker dance; Nico & Vinz performs.

It was all glitz and glamour in the ballroom as the remaining couples danced to songs from their favorite movies.

The couples dance to songs commemorating their most memorable year; Colbie Caillat performs.

The celebrities will switch partners, dancing instead with pros who were selected for them by viewers who voted on Twitter.

International superstar Pitbull returns to the ballroom and for the first time joins Julianne Hough, Carrie Ann Inaba and Bruno Tonioli as a guest judge MONDAY, OCTOBER 20 (8:00-10:01 p.m., ET) on “Dancing with the Stars.” Pitbull will kick-off the night with a steamy performance of his hit single “Fireball” followed by the nine remaining celebrities performing to a mix of his hits and personal favorite songs. Dance styles will include Salsa, Rumba, Foxtrot, Tango and Jazz. At the end of the night, one couple will face elimination.

The couples perform one unlearned dance and a team dance to Halloween themes and songs.

The couples perform during dynamic duo night; the couples face elimination.

The results are announced from last Monday night's performances as 1 Celebrity and their Professional dance partner are eliminated from the competition and then week #8 performances are seen.

Plugged/uplugged night.

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Results from last night's show are seen and the winning dance team is announced!

Season 31 kicks off with a star-studded cast of 16 celebrities performing live for the first time.

The six remaining couples dance to the music of Taylor Swift; guest judge Mandy Moore.

Five couples compete for a chance at winning the coveted "Len Goodman Mirrorball Trophy"; the finalists perform a redemption dance and an unforgettable freestyle routine.

A new cast of celebrities and their pro partners hit the dance floor for the first time to perform a Cha Cha, Foxtrot, Jive, Salsa or Tango; featuring a dazzling opening number to "Levitating" by Dua Lipa.

The 10 remaining couples take a moment to reminisce as they perform dances inspired by a pivotal year that held great significance in their lives.

Each of the five couples take the stage to showcase two all-new performances as they fight for a spot in the finale.

The 11 remaining celebrities dance to celebrate those things in life that give them pleasure. Each couple will perform a cha cha, Argentine tango, samba, Charleston, jive, jazz, Viennese waltz, salsa or quickstep, vying for America’s vote. At the end of the night, one couple will be eliminated.

Cher performs; the seven remaining couples perform.

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The nine remaining celebrities put on their Mickey ears and get ready to transform into some of their favorite Disney characters and perform to songs from classic Disney films.

Seventeenth Season Premiere. The couples will perform a Cha Cha, Foxtrot or Contemporary routine. In the new format the show is transitioned to a one night two hour show. The judge's scores will be combined with the votes of the previous week.