Role in the series
Hidden Cove first appears in the episode "Treasure of the Tides". Izzy joins Marina, Stormy and the mermaids to find the "Treasure of the Tides". Sseeing a golden opportunity to snatch the treasure, Captain Hook along with Mr. Smee set sail to Hidden Cove setting a blockade to prevent thwart the mermaids. Hook order Sharky and Bones to block the lagoon using the Jolly Roger but the two pirates were no match for Lucille the Seal who was able slip pass them and recruit the help of two blue whales to force the Jolly Roger out the way so Izzy and the mermaids could catch up to Hook and Mr. Smee.
While Captain Hook and Mr. Smee tried to keep the lead to the Treasure of the Tides. A large school of seahorses block the greedy Captain Hook's path. Thanks to Mr. Smee, Hook got an idea to keep Izzy and the mermaids at bay spooking the sea creatures toward Izzy and the mermaids. Hook could beat them to the treasure but Hook didn't count on Izzy's quick wit like in the episode "The Seahorse Roundup". Izzy, Marina and Stormy began to sing a lullaby to calm the seahorses down so they could safely pass.
Hook and Smee reached Hidden Cove to find the Treasure of the Tides and tried to pry the throne from a rock. Izzy and the mermaids tried to stop Hook but they were powerless to stop him until Jake, Cubby and Skully reach Hidden Cove with Izzy's Pixie Dust to turn the tide on Hook and Smee. The mermaids decide to make Izzy an honorary mermaid. Later that night, Jake and his crew took part in the celebration and Izzy is crowned "Mermaid of the Year".
Hidden Cove reappears in the episode Jake's Royal Rescue. Marina and the mermaids prepare a show in the honor of the mermaid ruler Queen Coralie who was on her way through depth of the Never Sea until she was captured by Captain Hook and his crew as ransom for the mermaids treasure. Jake and his crew soon learn of the Queen's plight and set a course to her rescue.