Watch Online Free on Watchseries. The Pirate Kids are back in an exciting new adventure! After finding Blackbeard's lost treasure, the Pirate Kids are once again targeted by their old foes, the Brethren of the Coast, a gang of modern-day pirates. The pirates believe the kids know the whereabouts of Blackbeard's Silver Skull Chalice, a legendary relic they plan to acquire by any means. Armed with a list of old clues, the Pirate Kids are thrust into another amazing quest.