Willy Wonka inspires the designers to create new inventions in fashion for an avant-garde runway; guest judges Andrew Rannells and Anna Camp.

RuPaul and Jesse Tyler Ferguson join the judging panel for a spectacular avant-garde runway.

At the Smithsonian in Washington, DC, designers are challenged to create 6-piece collections. A surprise runway sends one designer home early. Dita Von Teese guests.

Designers create looks to celebrate a woman’s inner superhero. Supermodel Karolina Kurkova guests.

Designers tear, dye and burn to create distressed fashion for a post-apocalyptic runway. Danielle Brooks guests.

An "opposites attract" theme tasks the designers to create red-carpet gowns for the Academy of Country Music Awards. Appearing: the country group Little Big Town.

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.

The designers must tap into their past to create a look inspired by a moment that kick-started their fashion career.

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A star of Broadway's "Finding Neverland" challenges the designers to re-imagine looks for classic fairy-tale characters.

Fashion designer Zac Posen and actress Debi Mazer join the judges to critique sophisticated summer looks with an edge.

Designers pair up to create fashion inspired by food and wine pairings. Whoopi Goldberg joins the judges for All Stars’ first ever double elimination.

Nina Garcia challenges the designers to create resort wear inspired by different Candy Crush lands. Nina Garcia and Kelly Osborne guest judge.

Miss Piggy takes charge as client and guest judge when the All Stars create a cocktail dress for the Muppets' most demanding diva. Will the designers live up to the high standards of this international fashion icon?

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

Eight all-star Rookies and eight returning all-star Veterans battle to create cohesive collections in the biggest season in All Stars’ history.

In the notorious unconventional challenge, designers use all types of balls to create modern day “ball gowns.” Kacey Musgraves guests.

Zac Posen invites the designers into his personal studio to gather material for red carpet looks that showcase a signature technique. Zac Posen and Rosie Perez guest judge.

Designers face off against one another to create performance wear for a music superstar. Olivia Culpo guests.

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 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.

The designers celebrate Baroque fashion by creating couture-inspired gowns. Marchesa's Keren Craig and Supermodel Coco Rocha guest judge.

Isaac Mizrahi’s exhibit serves as inspiration for colorful party looks. Legendary supermodel Carmen Dell’Orefice is a guest judge.