As always, through Ernst's narration and his diary we view life on the island though his eyes and realize that the Robinsons have been shipwrecked for approximately six months. The family celebrate their first harvest. All seems peaceful and idyllic, but while out hunting Joanna and Ernst discover animal spoor of a seemingly large ape like creature. David is keen to investigate, but Elizabeth is concerned for her family's safety. Christina is captured by Ben and Parsons, who take her back to their island. When Parsons sees her black pearl, he becomes convinced that the Robinsons have a treasure hoard. He persuades Ben they should go after it. Running from a wild cat in the forest Billy gets lost, and is stung by a strange insect in a swamp. Escaping a rain squall Billy hides in a small cave in the hills. When he wakes there is a large gorilla sitting in the mouth of the cave. With David and Ernst away searching for Billy, Parsons storms the tree house and demands the treasure. Emily ...