Holly's Million Gold Smile - S2.E6

The gang meets up with Niton, a snail-like creature who is a merchant. He sells them second-rate quality items and a fake mystery disc for Holly's dagger. Infuriated, they go to find him, but the Jells trap them on the beach and bury them. But the tide is coming in fast. Holly begs Niton to help, and he finally comes to his senses and does what is right. He digs them out and gives them a refund.