Scooby-Doo! Mystery Incorporated: Season 2, Episode 2

2 - 2: The House of the Nightmare Witch

Velma and Hot Dog Water (Marcie) are discovered to be working for Mr E and are going on missions for him, here they go to Russia to retrieve a piece of the Planaspheric Disc from an old house, bu when they are stopped by the Nightmare Witch they buy it and bring it to Crystal Cove where the house springs chicken legs and runs rampage over town. Meanwhile the gang are looking to replace Daphne and Velma suggests Hot Dog Water.