On the island, the chipmunks try to find food and they meet a castaway, Zoe (Jenny Slate). She shows the chipmunks her hut she built with a zip line. Eleanor sprains her ankle after falling from the zip line and Simon gets bitten by a spider. This gives him a neurotoxin disease making him believe he is a French explorer named "Simone." Simone asks Jeanette to dance, thinking she is beautiful, much to Alvin's dismay. Zoe takes Simone, Jeanette, Eleanor and Theodore to a waterfall and Simone finds a cave full of gold and jewellery.