This story is a sequel to Sonic The Hedgehog x My Little Pony: Make Your Mark - Season 4
When Opaline finds a fragment of the destroyed Paradox Prism, she gains the power to travel across the multiverse and cause chaos across all the realities. Now, the fate of the whole Multiverse, and the definitive battle between the light of the day and the darkness of the night relays on Sonic's hands and Sunny's hooves.