Scooby-Doo and Scrappy-Doo S01 E02 The Night Ghoul of Wonderworld

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.