What's Happened to Chloe the Caterpillar?

S1 E4: Jess wants to introduce Willow to his new friend, Chloe the caterpillar. But where's Chloe gone? He searches for her in all the places she might be, where he's visited her before, and where there might be juicy leaves she'd like to eat, but it's not until a butterfly breaks out of a little Chloe-shaped sack that Jess realises that Chloe's just changed!