Dino Boy and Ugh are attacked by poisonous wasps and Ugh gets stung trying to drive them away. Dino Boy must go to Mist Island to get some leaves in order to save Ugh from dying. Dino Boy and Bronty race to the water and Dino Boy gets on a raft and uses it to get to Mist Island after having some close calls.
Once there on the island, he finds that there are three Moss Men there as well and one of the three is tied down as a sacrifice. Dino Boy decides that he should save him and dresses up like a monster using a couple of logs for stilts and an Elephant Ear Plant leaf. He scares off the other tow and frees the last but the last thinks that he is a monster and runs off.
Dino Boy gets the herbs back to ugh and Ugh will recover after several days. Dino Boy uses this chance to try and teach Ugh some words.