Scooby-Doo and Scrappy-Doo

The Night Ghoul of Wonderworld (1x2)

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The gang buys Velma her fantasy, which is to be "Watson for a day" to a robotic Sherlock Holmes in a futuristic Londonworld at the Wonderworld amusement park. Although it's all supposed to be a game, there really is a crime to be solved.