They first appeared in Enter the Dragon. The Commander of Darkness kidnapped Mystique Sonia and took her here with the help of a dragon. First Squad and the Big Green Air Force followed, and fought with the Commander of Darkness and the dragons.
The Caves again appeared in Collision Course, when Commander ApeTrully went to them to aid the ailing dragons. After healing them, a storm destroyed the jet he had taken, but he was provided a ride home by the dragon queen.