What begins as a relaxing soak turns into a fight for survival in this delightfully absurd creature feature. When a mysterious, gelatinous entity emerges from the plumbing of a rundown apartment building, timid tenant Samara Weaving finds her quiet evening shattered. Teaming up with her skeptical, conspiracy-obsessed neighbor Kumail Nanjiani, she must convince the building’s eclectic residents—including the fastidious superintendent Steve Buscemi—that the growing, sentient blob in Apartment 3B is more than just a clog. Blending slapstick horror with genuine tension, the film pits this unlikely group against a slippery adversary that seems to feed on their deepest anxieties, all while confined to the claustrophobic, water-damaged hallways. As the creature’s influence spreads, turning everyday appliances into potential threats, the residents must overcome their own quirks and fears to prevent their home from being dissolved from the inside out.