The eight remaining designers must create stage looks for Australian twin sisters Liv and Mim, commonly known as the DJ duo NERVO. The pieces all must incorporate cutting-edge technology like LED lights and fiber optics; however, the real challenge comes when the designers must pair up into teams. Which twosome will learn how to work well together and which will implode? Recording artist Kid Cudi serves as the guest mentor.

The six remaining designers create complementary stage looks for country rock crossover group, The Band Perry, for an upcoming Nashville show. Making menswear for brothers Neil and Reid Perry throws some of the designers into a panic and tests who can adapt to an unfamiliar task.

The designers create looks inspired by old Hollywood glamour for Khloé Kardashian to wear at a Grammy Awards after-party. For the first time throughout the construction process, the designers receive no direction from the mentors. Instead, they must critique each other's work and use the lessons they've learned so far to guide themselves. Recording artist Ne-Yo is guest mentor.