A Dark Shadow is holding children captive in a magic castle in the Yucatan. Lana is called to free the children. A magic horse called Sure Foot picks her up. Marcos, Bruto the bear, and Poky the monkey are her helpers. They receive a special message in code and a treasure map. They have to find the key for the castle hidden in a treasure box. The castle is under surveillance and heavily guarded where the Shadow enslaves children and animals, including a dragon. A tiny white light guards the captive children, which is a white guardian. Lana is using her magic key, to overcome the Shadow's powers, free the children and transform the dragon and animals back into their natural state.