Thirteen fan-favorite, memorable and controversial designers from past seasons return to do fashion battle. In the opener, they are tasked with an unconventional challenge. Supermodel Angela Lindvall hosts and Joanna Cole serves as the mentor. Returning designers include Austin Scarlett, Mondo Guerra and Kenley Collins.

The all-star fashion aces race against time to spin out elegant ball gowns for a night at the opera. Design duo Mark Badgley and James Mischka are the guest judges.

The all-star designers ham it up when they create an elegant cocktail dress for one of the most demanding prima donnas in the entertainment industry: Miss Piggy.

The designers have a need for speed when they must race against time to create flashy and splashy wear fare for model Miranda Kerr. Fashion luminary Diane von Furstenberg makes an appearance.

The designers have to convince ordinary people on the street to give part of their clothes to them. They have to make new outfits from the clothes they get.

The eight remaining fashionistas weave their magic when creating sportswear as inspired by one of the four seasons. Designer Cynthia Rowley is the guest judge.

It's all about Broadway baby, when the designers compete for their Broadway debut. The award winning composer of "Wicked" Stephen Schwartz, challenges the All Stars to design an outfit for the Broadway musical "Godspell".

Angela Lindvall takes the designers to UN headquarters, where they have to find inspiration by a flag of their choice. Catherine Malandrino is the guest judge.

In the first ever Project Runway with dimmed lights the designers will showcase their avant garde looks under special lighting. Music legend Pharrell Williams is the guest judge.

The final five get a lesson in fashion business, but only three designers will proceed to the finals. Designer Nanette Lepore will produce the winning outfit, which will be sold nationwide for charity.

The final three designers have to create a signature collection in just four days for a red carpet event. The designers get surprise visitors in the workroom and Angela Lindvall has still a twist to announce.

Project Runway All Stars winner will be revealed after the final runway. Tommy Hilfiger is the guest judge.