A new cast of 13 celebrities kick off the competition by performing together to Erin Boheme’s “I Won’t Dance.”

The professional dancers perform together, Mackenzie Ziegler performs, and the cast of “Dancing With the Stars: Juniors” makes an appearance.

The 12 remaining couples dance to iconic songs from New York; Sarah Bockel performs; the couples dance to a style they haven't yet.

Blue Man Group joins the dancers for the opening performance; Boyz II Men performs; the couples dance to a style they haven't performed yet.

The 11 remaining celebrities stroll down memory lane and celebrate through dance a time in their lives that left a lasting impression.