Despite Pete and the gang's efforts to keep the fish-boy Mermin from making waves in their small town, he can't help but stick out! An amateur team of paranormal investigators has their sights on Mermin, and they think he's their chance to make it big! Meanwhile, Benni, Mermin's round aquatic companion, is ready to spill the beans about their lives in the underwater kingdom of Mer, but perhaps things aren't as simple as he says...