There's also 'Supernatural Scooby Doo: The Case of the Cursed Amulet'. In this one, they discover an ancient amulet that brings all sorts of supernatural trouble. The story does a wonderful job of blending the light - heartedness of Scooby Doo with more serious supernatural themes. It's full of action and mystery.
One great Supernatural and Scooby Doo fanfiction is 'The Mystery Gang Meets the Winchesters'. It combines the spooky elements of both universes really well. The characters interact in a believable way, with Dean and Sam Winchester teaming up with Scooby and the gang to solve a mystery that involves both ghosts from the Supernatural world and the more typical villains from Scooby Doo. It's a fun read that plays on the strengths of both shows.
One common theme is the clash of different worlds. The Scooby Doo gang is used to more 'family - friendly' mysteries, while Supernatural deals with darker and more dangerous supernatural elements. So when they cross over, there's often a theme of the Scooby gang having to adapt to this new level of danger.
You can try fanfiction websites like FanFiction.net. There are tons of 'Scooby Doo Supernatural Fanfiction' there. Just use the search bar and type in the relevant keywords, and you'll get a list of stories to choose from.
One popular story could be where the Supernatural characters team up with the Scooby Doo gang to solve a mystery involving a haunted mansion. In this fanfic, Dean might be showing Shaggy how to handle a shotgun while Sam is researching the history of the mansion with Velma.
One plot that stands out is where the Trickster from Supernatural decides to play a game with the Scooby gang. He creates illusions that mix the Scooby Doo villains with Supernatural creatures. The gang has to figure out which are real threats and which are just illusions, all while being chased by some really strange hybrid creatures. It's a plot that combines the mystery - solving aspect of Scooby Doo with the complex and often unpredictable nature of Supernatural.
One creative storyline could be that the Winchester brothers get stuck in a town haunted by a ghost. The Scooby Doo gang shows up to solve the mystery. Sam and Dean initially think the gang is just a bunch of amateurs, but they soon realize that the gang's skills in unmasking fake ghosts could be useful in their real - life hunting. Another idea is that a demon has possessed one of the Scooby Doo characters, and the Winchesters have to figure out which one and exorcise the demon without scaring the rest of the gang too much. A third could be that there's a cross - dimensional rift that pulls the two groups together to stop an ancient evil that is using both the Supernatural and Scooby Doo universes as its playground.
One great Scooby Doo Supernatural crossover fanfiction is 'The Mystery Inc. and the Winchesters' on FanFiction.net. It has an interesting plot where the Mystery Inc. gang teams up with Sam and Dean to solve a mystery involving a haunted mansion and a powerful supernatural entity.
To write your own supernatural scooby doo fanfiction, you need to know both universes well. Research the typical villains in Scooby Doo and the monsters in Supernatural. Decide on a setting, like a small town that has both Scooby Doo - style mysteries and Supernatural - style hauntings. You can also add some humor, like when Shaggy and Dean compete to see who can eat more burgers. Then, just start writing and let your creativity flow.
One idea could be that the Winchester brothers are hunting a ghost in a town where the Mystery Machine gang also happens to be. The Scooby gang initially mistakes the Winchesters for bad guys but then realizes they're all after the same spooky entity. They could team up, with Sam using his research skills and Dean showing the Scooby gang how to handle real weapons (in a non - dangerous way, of course).