S1, E103: Elias decides to go exploring in unknown waters without telling anyone, but he strikes a hidden rock and damages his propeller. It's up to Swifty to lead Helinor and Dippy to help him before he's dashed against the rock. / Trolley decides he'd like a day out in Cozy Cove to spend with his friends. But when he stows away aboard Trawler, his disappearance sets in motion a huge rescue mission.