Scooby Doo was in an extremely serious situation. They stopped for the night in an old castle. All was quiet, and the guys went to the rooms to get a good rest before the next day, but it was midnight .. Scooby could not sleep, and he decided to go out on the balcony to get some fresh air, that's just a sigh and did not succeed, because the castle attacked from the air hordes of horrible monsters!