Tracy Tailspin used to be dynamite on the roller derby track. She could bean-dip with the bests and grapevine with the greats, and she had the most legendary tailspin twister. But she retired at the height of her career, right after being made team captain, and nopony was ever sure why... Was it a hoof sprain? A team feud? An evil curse?! When Sunny's leadership style starts to remind Tracy of her own failed stint as captain, Tracy decides it's time to finally open up and share the story of her final days with the Dazzlebrook Dynamites.