Due to time constraints, Persin subcontracted the build of Monstro Eliasue’s suit to a U.K.-based company. “We had two full suits, one for a stunt double, and a half-built suit for Margaret, which she wore for closeups.” Persin and his team took care of all the effects, including the boob that squeezes out of one of Monstro’s many holes.

“The Substance” was lauded upon its premiere at the Cannes Film Festival earlier this year, where it was up for the Palme d’Or and won the best screenplay award. Earlier this month, it took home the Midnight Madness people’s choice award at the Toronto International Film Fest. “The Substance” is currently playing in theaters.

Demi Moore is trying to find the beauty in her new horror movie, The Substance. In the critically acclaimed project, Moore stars as Elisabeth Sparkle, an actress fired from her TV fitness show for being too old.