ABC 20/20

Host Tim Gunn will introduce this season's sixteen new designers with a behind-the-scenes look from their casting auditions.

The designers enter Season 16 in style as they must create a red carpet look that demonstrates their fashion point of view. But the real surprise comes when the designers learn they will be working with models of all sizes! Guest judge Olivia Munn joins.

In their first team challenge, the designers struggle to make their voices heard. However, this is an unconventional materials challenge and many of them stumble when forced to create a fashion forward look out of recyclable materials. Maggie Q and Anne F

The designers are treated to a private screening of the film Leap! as well as a performance by Hiplet and must draw inspiration for an innovative and edgy design in order to survive another week. Maddie Ziegler is guest judge.

It's the Heidi Klum Sleepwear Challenge and the designers are feeling on top of the world, literally. If a slumber party on the roof of the Empire State Building doesn't bring them the inspiration they need to impress Heidi, nothing will!

Drawing inspiration from the hit film Descendants 2, the designers visit Lyndhurst Castle and are tasked with creating a look that represents "Good" or "Evil." Most of the results are angelic, but as always, the devil is in the details.

The models become much more than runway eye candy as they serve for inspiration to the designers to create a street style look.

It's the JC Penney Challenge and the designers must use men's fabrics and designs to create a fashion forward look for their female models.

The designers are tasked with creating an on-the-go look for friends and family of the Project Runway crew, but the good spirited challenge takes an ugly turn when accusations of cheating cloud the results of a contentious runway.

The dramatic fallout from the cheating scandal rocks the designers and leaves everyone wondering how they'll move forward in the competition.

It's the Lexus Challenge, but this one is Unconventional and nobody is safe! The designers must use safety materials to create a look that wows the judges as Fashion Week is right around the corner. Guest judge is Carly Chaikin.

It's an emotional Runway as the designers create looks inspired by "Warrior Women" -- women who have battled breast cancer. Rachel Brosnahan guest judges.

The runway is converted into a Winter Wonderland as the designers are tasked with creating a winter-themed look that will decide who goes to NY Fashion Week and who gets left out in the cold. Guest judge is Katie Holmes.

After heading home to work on their Fashion Week collections, the five finalists 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 2 pieces from their collection.

Fashion week is finally here and the designers rush to put the final touches on their collections. Four designers will have their dream of showing at New York Fashion Week.

The season 16 designers reunite with mentor Tim Gunn to discuss their Project Runway experience. They come ready to reminisce, share emotions, and get to the bottom of the cheating scandal that rocked the season. And some of our favorite Models also swing by!