Menace of the Manticore (S01E21)

After the Mayor purchases a haunted temple off the Internet, Crystal Cove's only theme park - Creepy Spooky Terror Land - is besieged by a Manticore, an ancient beast with the body of a dragon, the face of a man and the tail of a scorpion. The Mayor begs the gang to help him solve this mystery and get rid of the Manticore before the theme park goes out of business. Turns out, though, that the park is owned by the father of none other than Hotdog Water, Velma's archenemy at school. And Hotdog Water makes it very clear... she does not want the gang's help. (iTunes)