Fluttershy

"Dr. Florence Shaw, physician and scientist, searching for a way to tap into the hidden strengths that all ponies have. Then an accidental overdose of gamma radiation interacts with her unique body chemistry. And now, when Florence Shaw grows angry or outraged, a startling metamorphosis occurs. The creature is driven by rage and pursued by an investigative reporter."

"An accidental explosion took the life of a fellow scientist and supposedly Florence Shaw as well. The reporter thinks the creature was responsible."

"A murder which Florence Shaw can never prove she or the creature didn't commit. So she must let the world go on thinking that she too is dead, until she can find a way to control the raging spirit that dwells within her."