Hosted by Tim Gunn, the Project Runway: Season 15 Reunion will bring the designers back together one last time to reflect upon the season's highs, lows, and most memorable moments.

The designers rush to put the final touches on their collections; four designers show their work at New York Fashion Week, but only one can be crowned as the winner; guest judge Zendaya joins the panel.

A countdown of the most memorable home visits in "Project Runway'' history.

Visiting the designers at home, Tim Gunn is not impressed with everything they've created so far; the designers return to New York and present three pieces from their collections; Michael Kors returns as a guest judge.

Zendaya joins Heidi Klum, Nina Garcia, Zac Posen and Tim Gunn on the runway as the guest judge for the finale.

The designers learn they have yet another trip, with twists and turns that will decide which designers compete at New York Fashion week.

The designers learn they have yet another trip, with twists and turns that will decide which designers compete at New York Fashion week.

Counting down the best and worst avant-garde looks in the series' history.

The designers create innovative avant garde looks, crafted from conventional fabric and unconventional metal-themed materials, in the first ever hybrid challenge.

The designers create innovative avant garde looks, crafted from conventional fabric and unconventional metal-themed materials, in the first ever hybrid challenge.

Counting down the best and worst "Marie Claire'' looks from the show's history.

The designers go on a helicopter ride above New York; the designers must create an editorial, high fashion look for "Marie Claire'' magazine.

The designers take a majestic helicopter ride high above New York City for inspiration for their next challenge: to create an editorial, high fashion look for Marie Claire Magazine. Guest judges Anne Fulenwider and Camilla Belle join the panel.

Each of the remaining designers is visited by a special guest from home; the designers learn that their newly arrived loved ones will be their clients for the next challenge.

A countdown of the best and worst team challenges in "Project Runway'' history.

The second Team Challenge of the season leads to tensions and tantrums as the designers are forced to work together to create three-piece collections for a SoHo pop-up shop; Kelly Osbourne returns as a guest judge.

The second Team Challenge of the season leads to tensions and tantrums as the designers are forced to work together to create three-piece collections for a SoHo pop-up shop; Kelly Osbourne returns as a guest judge.

Revisiting the best and worst inspiration challenge designs in "Project Runway'' history.

The designers recharge at Universal Studios Orlando, and must take in inspiration to design a look for Urban Jungle.

The designers recharge at Universal Studios Orlando, and must take in inspiration to design a look for Urban Jungle.

The designers excitedly attend a press event, but their festive mood sours when the party turns out to be a challenge; many designers have to start over after receiving criticism from Tim Gunn.

The designers excitedly attend a press event, but their festive mood sours when the party turns out to be a challenge; many designers have to start over after receiving criticism from Tim Gunn.

In the season's first team challenge, the designers must pitch their collection ideas to raise money from a group of mystery investors.

Actress and singer Sabrina Carpenter joins the judge's panel; the designers must pitch their collection ideas to raise money from a group of mystery investors; the stakes rise as the winning team members will each receive $5,000.

The designers must create their own fabric to use in a stylish swimsuit; the contestants' lack of swimsuit experience makes the challenge difficult.

In the Heidi Klum Swimwear challenge, the designers create their own fabric to use in designing a stylish swimsuit.

The designers are tasked with creating a look that sparkles both in daylight and under black lights; unusual materials cause several designers to have anxiety.

The designers are tasked with creating a look that sparkles both in daylight and under black lights; unusual materials cause several designers to have anxiety.

The task of creating an outfit that is flattering to all body types poses a greater challenge to some contestants than to others.

The task of creating an outfit that is flattering to all body types poses a greater challenge to some contestants than to others.

Sixteen new designers head to New York to compete; the designers must use party decorations to create their looks in the first unconventional materials challenge.

Tim Gunn introduces this season's 16 new designers with a behind-the-scenes look at their casting auditions.

Tim and Zac discuss the emotional moment when a contestant proposed to his partner on a previous season.