The Shadowless Stone - S1.E19

David and Lisa are summoned to the palace of King Conrad. The king lives behind a waterfall and has a jester named Tim. King Conrad tells the gnomes he wants them to go to the island of Mentoa and find the valuable shadowless stone. The stone is a royal treasure and it is stolen by the trolls. David and Lisa jump down a deep hole, then sail across an eerie red sea. David and Lisa enter Mentoa, a mountain with 1000 steps leading to the top. At the top of the stairs is a chamber holding the stone. Once David picks it up, the trolls materialize out of thin air and chase him and Lisa down the steps. But the trolls can not exit the mountain, because only a person with a kind heart can open the entrance door!