Mad Men star Elisabeth Moss will guest star on the upcoming intense episode of the Project Runway All Stars on Thursday.

During the episode, the six remaining contestants will be under major pressure to create the perfect Oscar dress for QVC host Lisa Robertson.

"There's no more safe," one contestant is heard saying in the teaser clip.

Georgina Chapman & Alyssa Milano Talk About The Fashion Show [EXCLUSIVE]

As concluded by the teaser, the process won't be an easy one for the designers, including one who creates a white dress that rips up on the runway.

"This dress was literally falling apart at the seams," the show's host Alyssa Milano tells the contestant.

For the lucky designer who wins the challenge, he or she will have their look remade and sold on QVC.

The remaining six designers include Christopher Palu, Elena Slivnyak, Irina Shabayeva, Korto Momolu, Seth Aaron Henderson and Viktor Luna.

See the judges, Isaac Mizrahi, Georgina Chapman, and mentor Zanna Roberts Rassi, as they deal with the contestants when the episode airs on Thursday at 9 p.m. EST on Lifetime.