Pinkie Pie is just a random, fun loving, party pony that live in Ponyville with the Cakes family. Her sisters come over for a visit and tell them about their parents deaths. While she at her parents funnel, she meets a old friend of her parents name Hazama Lions and is ask to come with him, alone. He tells her he knows who kill Pinkie's parents and wants to talk to her about it. When they reach a factory, he tells her that he kill her parents and shoots her in cold blood. Pinkie falls into a chemical and is left for dead. Luckily her sisters find her and she is hospitalizes until she feels better, Pinkie then learns that the chemical had gave her super speed and zooms around having fun. When she spot a crime happens in her home, Pinkie uses her speed to stop it and then decide to become a hero. The Fastest Mare in Equestria, Fili-Second. She also learns a dark secret to her her new powers.

Part of my Power Ponies Stories. Four of Six.