"Las Vegas" is this week's theme and the remaining dancers are tested with styles they've never encountered before. One mom finally snaps and takes on Abby after she gives one too many criticisms about her daughter. With the pressure of the surprise immunity reward building, tempers between the moms reach a boiling point.

Abby decides to mix things up with the theme for the week being "Unconventional." Anything can, and will happen, starting with the remaining dancers battling Abby in a martial arts challenge. The winner's mom gets to decide which dancers land in the bottom three, leading to new fights and some surprise allegiances. To complicate matters further, each dance involves a giant, and sometimes unpredictable, prop.

Judge Rachelle Rak, a veteran of "The Great White Way," leads the challenge for the "Broadway" themed week and blows the kids and moms away with her sassy moves. The challenge winner's mom earns the animosity of the others by bragging about her child. The pressure is on for the dancer who chooses the first solo of the season...will they triumph, or go down in flames?