"The Substance" (2024) tells the story of Elisabeth Sparkle, a fading Hollywood star who, after being fired from her TV show due to her age, discovers "The Substance," a black-market drug that allows her to create a younger, perfect version of herself. This younger version, Sue, lives alongside Elisabeth, but the two must share a life, alternating weeks. The film explores themes of aging, beauty standards, and the lengths people go to maintain a youthful appearance.