Marcy Fleach, better known as "Hot Dog Water", is a villain turned hero on Scooby-Doo! Mystery Incorporated. She a friend and former rival of Velma Dinkley. Her cruel nickname supposedly comes from smelling like recycled water used to cook hot dogs.
She was sent to prison for trying to close down an amusement park dressed like a Manticore and eventually released early and then worked for Mr. E. During this time she befriended Velma, gaining membership into Mystery Incorporated as a mole, temporarily replacing Daphne Blake. When Daphne returned she was forced to leave, and continued working for Mr. E. She was sent to Mount Diabla to retrieve a piece of Planispheric Disk, but handed it to the gang because she couldn't betray Velma, her only friend; ince then she went into hiding, still managing to help Mystery Inc. in an elaborate scheme to get Mr. E's pieces of the Planispheric Disk which she stole personally.