Rugrats - Season 4 Episode 10
Faire Play

The Rugrats and the Pickles go to a medieval fair, where Didi, Stu and Grandpa will be helping out. While Didi makes stained-glass windows, Stu and Grandpa operate a mechanical dragon that Stu invented. However, thanks to the mechanical dragons numerous glitches, it ended up making an ""Ye Olde Mess"" out of the entire fair. However, theres one thing that can help defeat the dragon... Reptar. And its all based on the Rugrats wishes.