The Emmy Award-winning competition series that started it all returns to the workroom with mentor Christian Siriano along with judges Nina Garcia, Brandon Maxwell and Elaine Welteroth. Fourteen of the most beloved designers from across 19 seasons are given one last shot to change their life forever with a career-defining win. The All-Stars put it all on the line for a chance at redemption in a high-stakes season full of surprises and a twist that changes the game.   Each 90-minute episode will feature challenges that test their artistry and push their limits, including an unconventional challenge that takes everyone by surprise. Other challenges include the return of the classic denim challenge and a uniform refresh for fan favorites from the cast of “Below Deck.” The city awakens once again to become the creative playground for these all-star designers, with iconic locales such as FAO Schwarz, historic Franklin D. Roosevelt Four Freedoms State Park and glossy skyscraper SUMMIT One Vanderbilt.   Some of the most exciting names from across fashion and the arts guiding the designers to glory on the judging panel for season 20 include actor, author and activist Alicia Silverstone; actor, singer, producer and director Billy Porter; fashion designer Zac Posen; CEO & founder of “alice + olivia” Stacey Bendet; creative director of Carolina Herrera Wes Gordon; actor, producer and Emmy Award-winning writer Lena Waithe; image architect and celebrity stylist Law Roach; actress, producer and ’90s icon Jennie Garth; author, actor and model Paulina Porizkova; designer Sergio Hudson; actress, artist and model Julia Fox; designer Willy Chavarria; “Below Deck” co-star Kate Chastain; “The Real Housewives of New York City” Luann de Lesseps; designer Batsheva Hay; Emmy-winning actor Coleman Domingo; and Steven Kolb, CEO of Council of Fashion Designers of America.   Throughout the All-Stars season, fashion lovers will see designers sketch, erase and resketch their creations thanks to Pilot FriXion Erasable Pens, the returning Official Grand Prize partner who will award $250,000 to the winning designer. Additionally, they’re competing for a career-changing mentorship with the CFDA (Council of Fashion Designers of America) and a feature in Elle magazine.