During Rainbow Dash's double rainboom, it opens up a dimensional rip between worlds that drags Pietro from the rule 63 universe, along with his new girlfriend Barb the Dragon, and his newfound goblin sidekick Gnat, and they land in a universe where Rainbow Dash failed to perform the Sonic Rainboom and was killed during the first attempt in the big race. As a result, the Elements of Harmony's fates change dramatically, and shit hits the fan.