Muscle Princess's castle is a small castle inhabited by Muscle Princess, and is located in the forest near the tree of Mrs. Yoder. The castle made its first appearance in "To Cut a Woman's Hair". It is unknown whether this castle or the area surrounding it is part of Muscle Princess's kingdom, or if there are any other inhabitants besides Muscle Princess. The number of rooms in the castle is also unknown, and only Muscle Princess's bedroom (as seen in "Princess Monster Wife") has been shown so far.


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