Lifetime is bringing back from of "Project Runway’s" best-known contestants for special "All-Star Challenge" edition of the competition series, Entertainment Weekly reports.

The two-hour special will air Aug. 20 at 8 p.m. EST, followed by the sixth season premiere of "Project Runway" at 10 p.m. and the series premiere of the new show "Models of the Runway" at 11 p.m.

The eight contestants competing in the challenge are season two’s Santino Rice and Daniel Vosovic; season three’s Uli Herzner, Mychael Knight and Jeffrey Sebelia; season four’s Chris March and Sweet P and season five’s Korto Momolu.

The eight designers will head back to the workroom with Tim Gunn and face judges Heidi Klum, Michael Kors and Nina Garcia for a chance at a $100,000 cash prize.

–Sergio Ibarra