The Fastest Pony In Equestrian History

Rainbow Dash heads to a family reunion with her family, as her friends have ways to be capable of walking on the clouds to join her whether through balloons or magic, and meets her father's best friend, Sparkleworks, a Pegasus racer and pyrotechnician who builds and sells fireworks, and had recently made one for Rainbow Dash called the Rainboom Firework, which simulates a Sonic Rainboom, finding it nice to know his friend's daughter has grown up to become a Wonderbolt. However, the Wonderbolts themselves have come as they say that there's a rogue Pegasus named Scarlet Flame running amuck, as she has firework-like flying abilities, which is apparently derived from the same family as Sparkleworks, as the two are distant cousins, and cousins who didn't know each other and that both are descended from yet another legend, Firework Burst, the fastest Pegasus in Equestrian history whom even Rainbow Dash couldn't break the record of, as he was said to be so fast, he could shift time and travel at the speed of light. Now, they have word that Scarlet herself is aiming to learn this in order to travel back in time to get revenge on the Wonderbolts for ruining her image as a legend by turning her in and reporting her fraud publicly after she refused to give up her attempt to be like her ancestor by cheating through a relic belonging to war Pegasi of the times of Wonderbolts' ancient past, all with the aid of not just a cousin of Rainbow named Opaque Dash who was sent to jail bitterly for causing a Double Rainboom like in the fanfiction of the same name after taking MIMs, as well as Wind Rider, Svengallop, and Gladmane are aiming to do the same to undo their defeats. But she doesn't know that Firework himself tried to turn back time with his speed, but because it was as unrealistic as Superman's attempt to do so, it would only tear up the world, as the claims were only a myth based on silly science, as this was told to Rainbow by former middle-aged Wonderbolt drill sergeant named Toroid Vortex, who claims following a failed and near-fatal attempt to stop Scarlet that, though she won't be as fast as her given she trained harder than her to Batman levels that she cannot compete with, she can be smarter, which is something Rainbow clearly needs given what earned her the nickname 'Rainbow Crash'. How will this threat be dealt with before she tears up the world trying to turn back time?