The supermodel and executive producer Michael Rucker discuss their homecomings to the series, the dynamic cast and why Christian Siriano remained as the designer’s mentor with the network shift.

Season 21 of the fashion design competition is set to premiere on Thursday, July 31. It will see the return of Heidi Klum as host, alongside Nina Garcia and Law Roach as judges and Christian Siriano as mentor. The show, which has aired on both Bravo and Lifetime, is moving to Freeform this season.

The challenge was announced Wednesday, July 16 as contestants Ethan Mundt, Belania Daley and Jesus Estrada appeared on "GMA" and competed in the preliminary Caffeine Couture Challenge, which saw them sew sartorial creations in an ode to the caffeinated beverages so many of us love to sip each morning.