"Scooby-Doo!" will tell about the very first meeting of future best friends Scooby and Shaggy and how they joined young detectives Fred, Velma and Daphne to create the famous Corporation "Mystery". And now, after a hundred solved cases and adventures, Scooby and his team are faced with the greatest mystery — a plot to open the ghostly dog Cerberus the way to our world. While the guys are trying to stop the "pespokalipsis", they find out that Scooby has a secret legacy and a legendary future awaits him, much more grandiose than anyone could have imagined.
After disclosure of the next business the team of detectives goes to have a rest on "The cool beach" where the competition on "separation" has to be held. Having arrived to hotel, they learn that the beach was attacked by spirits of pirates of Ulyot and the Beach, founders of "The cool beach", and stole piracy hats which awarded winners of competitions. Fred Jones and Velma Dinkli should prove to the friends that they are able to have a really good time, and to the team of detectives — to save the beach and to expose the swindlers disappearing under masks of pirates.