The hot and horny mermaid from "Talk Dirty To Me, Part Three" returns…this time bringing her sister mermaids to sample the sins of the big city. Unfortunately, the city water becomes poisonous to them and they must return home. Atlas, our aquatic heroine is nowhere to be found. Her quest for sexual gratification has led her astray. The mermaids seek out Jack. Jack agrees to find her and discovers once again that what smells like fish, and taste like fish, may sometimes just be fish.