The Old Castle is a castle that is one of the bases used by both Ranamon and Mercurymon and it is located in the Continent of Darkness within the Digital World. After Duskmon scatters the DigiDestined after their defeat within the Forest of the Continent of Darkness, J.P., Zoe, and Tommy are captured by the dark Legendary Warriors and chained to walls while Datamon, protected by a barrier, work at releasing the Spirits from their D-Tectors.