Stacy-X first appeared in "Uncanny X-Men" #399 (November 2001). Her real name is Miranda Leevald, and she has the mutant ability to exude pheromones which she could control to stimulate bodily sensations and functions of others, such as causing orgasms or vomiting. Her mutation also had a physical manifestation: at the age of sixteen Stacy's skin was replaced by patterned, snake-like scales. At one point her skin was shown shedding, much like a real snake's. She later became known as Stacy-X.