Pan's plan threatens to disrupt the citizens of Storybrooke's joy over Henry's return. Snow and Charming spend their honeymoon searching for a mythical being that could stop Regina.
Ariel is sent back to Storybrooke with an item that will help Belle find a hidden artefact;. Hook, Neal and Emma set out to capture Peter Pan's shadow and Mary Margaret is upset that David concealed his poisoning.
While Henry's life hangs in the balance, the race is on to stop Pan from gaining full magical powers from the heart of the truest believer. Regina wants to become a mother and decides to adopt a baby.