Stu Pickles, Tommy's dad, creates the PlayPalace 3000, which is a huge playground made out of many zones that expands out of a small metal cylinder. He needs to leave to get duct tape and paper clips, so he leaves Lou Pickles to watch the kids, and when he falls asleep, Angelica enters the PlayPalace 3000 and takes their toys. She challenges the Rugrats to come and take them back. (Rugrats Wiki)