Demi Moore had quite the Halloween surprise for fans of The Substance. In celebration of her horror film becoming able to stream on MUBI, the actress decided to share four shocking behind-the-scenes photos from the set of her latest critically acclaimed movie.

In one of the pictures, Moore’s face is covered in blood, to the point where even part of her shirt is stained. In all of the photos, Moore has prosthetics on her face, head and body for her transformation into an elderly woman — saggy boobs and all.

The four-photo gallery features Moore in eerily lifelike prosthetics that transform her into a grizzled, warped, and distended old creature. In one she wears a prosthetic skin covering her top half and bike shorts while holding her micro-Chihuahua, Pilaf. In another, she takes a grimacing selfie splattered in fake blood.

Demi Moore shared stunning behind-the-scenes photos from The Substance, which show her as the dramatically aged character Elisabeth Sparkle.