The All Stars are tasked with recreating and updating a 70's disco style using Nine West shoes of their choosing as inspiration! Designer Rafe Totengco guest judges.

Graffiti artists help the designers tag their fabric with spray paint from which they must create wearable art. Designers Robert Tagliapietra and Jeffrey Costello serve as guest judges.

Social media and fashion collide when the All Stars must draw inspiration for their runway designs from images sent to them by readers of USA Today. Guest judges are designer Charlotte Ronson and fashion blogging sensation Tavi Gevinson.

The designers create edgy, androgynous apparel in a challenge that comes with a twist. Guest judges: Jason Wu and Robert Rodriguez.

The All Stars gather at NYC's Highline and are challenged to create a red carpet gown using only green, eco-friendly fabrics and materials. The legendary Diane von Fürstenberg guest judges.

The seven remaining designers play naughty or nice in the fan-favourite unconventional challenge that brings them to a Christmas décor emporium. The designers will have to impress guest judges singer Kylie Minogue and television personality LaLa Anthony.

The final six All Stars are tasked with designing a look for one of three vintage 1920's events. To make matters worse, they must face off against each other in pairs of two in this season's Fashion Face Off! Actress Gretchen Mol and designer Jenny Packham serve as guest judges.

High Fashion meets a Retail Budget! The five remaining All Stars must create a ready to wear look with a "wow factor," while also meeting a retail budget. With Elie Tahari as this week's guest judge and mentor, the designers all compete for the chance to have their design manufactured, featured and sold in Elie Tahari's stores and online! Stacy Kiebler also guest judges.

The Project Runway designers pay their tribute to the armed forces! The four remaining designers are paired with four female veterans from an array of different military branches. The designers will have to battle it out to see who can create a design that best suits each veteran for each of the special events they are attending. Special guest judges for this episode include actress Katie Holmes and designer Carmen Marc Valvo.

The designers go international! For the first time ever in Project Runway history, the designers retire sketching at 1407 for a day of sketching in Paris at the Eiffel tower! The designers also get a once-in-a-lifetime opportunity to tour Valentino atelier and showrooms, and are also invited to a private preview of Valentino's Couture show. With all of their newly acquired Parisian knowledge, the designers return to NYC to design a couture gown of their own that will hopefully secure their spot in the finale! Guest judges to determine who goes to the finale are House of Valentino and Cynthia Rowley.

The three remaining designers compete in the final for a chance to win a life-altering grand prize! However, because this is All Stars, the final three designers only get four days and an hour and a half at Mood, to complete a full mini collection. With the help of previously eliminated designers, the final three duke it out and give it all they've got to prove who Project Runway's true All Star is. Who will win the biggest prize in Project Runway history? Stay tuned to find out! Actress Liv Tyler and designer Marherita Missoni serve as the guest judges.