Sonicunderground Stories

Sonic dug through a box of his old things. "Why are we selling our old stuff again Tails?" He asked as he pulled out some old sneakers "It's either this o...

Six years ago, Sonic left his home, his kingdom, and his family behind to stop Robotnik from taking over the world. Everyone knows that story. But what happens when his...

After about a month of Eggman being "retired," the gang gets a visit from a stranger... a stranger that Sonic recognizes... his mother Queen Aleena.

Sonic Underground has completed its mission and the royal hedgehogs have reclaimed their kingdom... now what? Anarchy, that's what! Well, at least, that's what Sonic bel...

After being missing for about 4 years Sonia, Manic, and Queen Aleena have finally located their missing family member. Sonic the Hedgehog who disappeared after Robotnick...

Meet Princess Kadence the Hedgehog or "Kade" for short, the eldest sibling of her triplet siblings Sonic, Sonia, and Manic. When the evil Dr. Robotnik took ove...

Its sonic's birthday and sonic and his friends find out a little bit of his past and meet a few family members has well but will the prophecy change or stay the same

Feeling guilty of the events from "Love and Loyalty", Silver sets out to clear his mind of Blaze. However, those plans might blow up when an energetic pink hed...

8 years ago, Sonica lost her siblings. Soon after, she adopted Tails as a brother. Now, on their 18th birthday, they're back! For most of her life, Sonica has pretended...

Sonic's past is a twisted one that he's been running from. He's been running from it for who knows long? His friends know nothing about the blue hedgehog's past. Not eve...

My twist on a Sonic X/Underground fanfic! There's no Chris, and it's completely original from where I make friendships. It's a bit AU. Includes some OC's. Orrrrr. Sonic...

I don't remember how I died, nor do I remember the life I had before. All I really remember is what my name was and all the franchises that I adored. What happens when i...

Due to Dr. Robotnik leaving Robotropolis to conquer South Island, both Sonic and Knuckles leave to pursue him. What happens when Robotnik brings back a blast from Sonic'...

this is the second version of this taking place after the three fanfics (sonic characters react to him, super smash bros reacts to sonic, and sonic the last smash fighte...

Sonic left Robotropolis at the age of eleven, going after Robotnik. After five years can he go back his kingdom? A story I uploaded on to FanFiction.net which became pop...

Sonic transferred to this new school and there she met a lot of people with different personalities, some similar. And the boys, never left her alone. There she made fri...

AU! Elements of the games, Archie Comics, SatAM, Underground, OVA, and Sonic X Anime apply into one different universe. The villainous Dr. J. Ivo "Eggman" Rob...

It's been a week since Solaris was defeated. Sonic and Shadow are 'brothers' now and Shadow has moved in with him and Tails. In his quest to uncover the rest of his past...

Sonic, Manic, and Sonia must flee from Mobius to Earth when their home on the planet of Mobius is attacked by a tribe of echidnas. On Earth, they must hide and all they...

Beautiful princess Mina Mongoose has been locked away in a tower since she was captured as a baby by an old hag. Her magical long purple hair with blonde highlights has...