S2, E6: Dark Orca pirate-boy Smiling Finn steals a treasure map from his father and comes to the Nektons pleading for help. He wants them to stop his father, Captain Hammerhead, from stealing a particular treasure! Ant finds this very puzzling—why would a pirate not want to steal a treasure? Despite their reservations, the Nektons help out and save the treasure from the pirates. But in the process, Will gets very sick and collapses. The Nektons have no idea what’s wrong with him and it’s getting much worse by the minute. It seems Finn hasn’t told the Nektons the entire truth. He finally admits that the treasure is cursed! He was trying to protect his father from this and now it seems Will has succumbed to it. But are curses for real? Fontaine doesn’t think so. The Nektons have to find the truth about this treasure before Will becomes its latest victim! Returning to the area where they found it, they search for clues. The treasure ship was wrecked on a coral reef—is that significant? But Finn’s father and his crew arrive, determined to disown his “traitor son” and retrieve “his” treasure! In the ensuing battle, the pirates are driven back, but Will is still desperately ill. Finn, Ant and Fontaine finally deduce that a toxin produced by the coral around the treasure is responsible for Will’s sickness. Kaiko is able to produce an antidote, and Will is finally saved. Finn eventually returns to his family and is accepted by them only when he convinces them it was all a plot to poison the Nektons. Hammerhead is now proud of his son, thinking he’s very creative.