Kicking off the season with an unconventional materials challenge, Heidi and Tim welcome the designers at a season 15 launch party.

The designers must create an outfit to flatter all body types, and the challenge proves to be more difficult for some than others. Guest judge Nina Dobrev.

In Project Runway's first blacklight challenge, the designers have to create a look that sparkles not only in daylight, but under blacklights on the runway as well. Anxieties rise when the unusual materials leave many of the designers in the dark. Written by Benedicte Frost

In the Heidi Klum Swimwear challenge, the designers create their own fabric to use in designing a stylish swimsuit. The winner will have their design sold as part of Heidi's swimwear line. But the contestants lack of swimsuit experience makes for a harder challenge than expected. Model Lucky Blue Smith is this week's guest judge. Written by Benedicte Frost

Actress and singer Sabrina Carpenter joins the judges' panel in the season's first team challenge, the designers exercise their business savvy when they pitch their collection ideas to raise money from a group of mystery investors. The winning team members will each receive $5,000, and the winner will be featured in Marie Claire Magazine. Written by Benedicte Frost

The designers are excited to attend a Press Event, but their festive mood is quickly spoiled when the party turns out to be a Challenge. The misdirect proves to be more than most of the designers can handle as many of them have to start their looks over completely when criticized by a disappointed Tim Gunn. Emily Ratajkowski joins the judging panel. Written by Benedicte Frost

The exhausted designers are whisked away to Universal Studios Orlando to recharge their batteries with a roller coaster or two, and are challenged to find inspiration from their experience at the theme park to design a look for the Urban Jungle. Guest judge Rebecca Minkoff joins. Written by Benedicte Frost

The designers are faced with their second Team Challenge of the season, and must work together to create 3-piece collections to be shown in a SoHo Pop Up Shop. However, working in teams leads to tensions and tantrums as the designers struggle to have their voices heard. Guest judge Kelly Osbourne returns. Written by Benedicte Frost

The designers are pleasantly surprised when each one of them is visited by a special guest from home. But the emotional reunions with their mothers, daughters, and friends are quickly overshadowed by the drama of the next challenge when the designers learn that their newly arrived loved ones will also be their clients-and there is $50,000 on the line. Olivia Culpo and Katia Beauchamp join the judging panel. Written by Benedicte Frost

The designers take a majestic helicopter ride high above New York City for inspiration for their next challenge: to create an editorial, high fashion look for Marie Claire Magazine. Guest judges Anne Fulenwider and Camilla Belle join the panel. Written by http://www.mylifetime.com/shows/project-runway/season-15/episode-10

In this first ever hybrid challenge, the designers must create innovative avant garde looks, crafted from conventional fabric and unconventional metal themed materials. It is a runway to remember!!!

The designers are shocked to learn that they have yet another trip. This time, to a very unlikely place! The twist and turns never stop coming during this final challenge which decides which designers will compete at New York Fashion week.

After heading home to work on their Fashion Week collections, the designers are visited by Tim who is not impressed with everything they have created so far. The designers return to New York and present the judges with three pieces from their collection and all of them realize how much work they have left before presenting all of their pieces at Fashion Week. Michael Kors returns as a guest judge.