Robotnik and the Mushroom planet

After settling in Green Hills, Sonic is eager to prove he has what it takes to be a true hero. His test comes when Dr. Robotnik returns, this time with a new partner, Knuckles, in search for an emerald that has the power to create and/or destroy civilizations. With Velma, Fred, Daphne, Tom, and Maddie in Hawaii for Fred and Daphne's wedding, it is up to Scooby, Shaggy, Sonic, and new friend Tails, to embark on a globe-trotting journey to find the emerald before it falls into the wrong hands.

I own neither Sonic the Hedgehog or Scooby-Doo.

THIS STORY IS NOT REALLY COMPLETE, PUTTING IT ON COMPLETE TO KEEP IT SAFE FROM WATTPAD DELETING IT