Crossover but weirdly
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Might Not Have, Did Not Lose by The_O_IsSilent
Fandoms: Sonic Underground, Sonic Boom (Cartoon)
07 Feb 2026
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Summary
Even though he’d grown up for a good portion of time without them, finding his triplet siblings Manic and Sonia was the best thing that ever happened to Sonic.
Saying goodbye to them was the worst.
After a failed mission to get their mother back ended in disaster, Sonic decided they needed to switch tactics. The only way to do that seemed to be splitting up, as much as they all hated it.
Now it had been five years, and he hadn’t seen his siblings since that day. Sonic was living out his days in a beach hut on some unnamed island, keeping things steady and laying low. Until Sonia and Manic show up out of the blue with the first new bit of information they’d heard about their mom in years, and the peaceful life Sonic had come to know disappeared in an instant.A song-fic set on the Sonic Boom Island but with Sonic Underground Background. This whole funky little universe is inspired by a random text my roommate sent me that said "Sonic Boom Sonic is def Sonic Underground Sonic and the bandana is to cover his necklace" so that's what we're working with.