The castle belonged to Pearl Forrester's ancestors, and it was implied that their "spirits" remained connected to the Castle. The Castle was accessible to local peasants. The Castle has hosted some misled cruise passengers (Experiment #911) and the pancake breakfast for the Delta Knights (Experiment #913). In Horrors of Spider Island (Experiment #1011), Pearl became annoyed with a local ordinance requiring her to pay for a monkey license, so she had the Castle moved to a less costly municipality (at great expense). At the end of the episode, she had it moved back.