为了应对现代人肉体和精神上日益严重的压力与紧张，英国制药巨头N-gen公司开发出名代号为RAK295的机能提升补充剂。在投放市场前，N-gen找到3万个志愿者进行临床实验。两个月后，灾难如暴风雨般降临。RAK295引发极为严重的副作用，3万名志愿者几乎全部遭受痛苦的折磨，只有名为安吉拉·米尔斯（玛安娜·本灵 MyAnna Buring 饰）的女子至今杳无音讯。
科尔（克莱格·菲尔布莱斯 Craig Fairbrass 饰）受雇寻找安吉拉，以揭开RAK295失败的原因。与此同时，志愿者的身体相继发生变异，继而化身成为嗜血如命、毫无人性的恐怖丧尸。被他们袭击后的人也相继变为丧尸，人类的命运危在旦夕。寻找安吉拉的使命由此变得更为重要……

After a failed suicide attempt, Dawn (Jodie Jameson) is sent by her psychiatrist on a trip to recuperate. She visits an old family flat in a remote apartment by the sea. Heavily sedated with medication and alcohol, she tries to decode her life through the pages of a journal. Walking on a deserted Norfolk beach she finds a dying mutant mermaid foetus. Initially repulsed, she becomes obsessed with it, takes it home and tries to resuscitate it. Dawn’s Swedish friend Milla visits at the weekend. While out drinking with Dawn, she catches a man at an unguarded moment and they end up in bed. In the cellar, the creature can sense the vibrations from the bedroom. Feeding off the sexual energy coursing through the flat, the creature strengthens and grows. After Milla leaves, Dawn checks on the creature in the cellar; it’s covered in a thin slime. Drawn to the smell, she tastes it and finds that it has hallucinogenic effects. Dawn’s life is about to get even stranger.