Dr. Quigley Kim - An absent-minded bug scientist, Dr. Kim is working to gain fame and funding.  Too bad all the money is going to Craven's sophisticated facility instead.  How far would she go to discover the latest breakthrough in entomology

The Hardy Boys - Frank and Joe are in Hawaii to investigate the Mapu family for any hidden skeletons.  With a lucrative endorsement contract on the line for Pua, the Hardy Boys only have a few spare moments to lend Nancy a hand. Ned might be a little jealous that Nancy gets to spend time with the brothers on the beach, but they've got a mystery of their own!

Pua Mapu - She spends her days training to become a professional surfer and claims that she doesn't have time for anything else.  Sure she can surf all day, but what does she do when the sun sets and the ocean becomes a pit of blackness?  Secretive and talented, Pua also helps her dad, Big Island Mike, at the Immersion Excursion.

Big Island Mike Mapu - Mike Mapu runs the Immersion Excursion with the help of his daughter Pua, but it seems like the tourists just aren't interested in the 'real Hawaiian experience.'  He practically has to force tourists to catch fish, string necklaces, and go snorkeling.  The FTC isn't going to like the way he does business...

Malachi Craven - Known for his tantrums and running the Hilihili Research compound with an iron fist, this scientist has attracted the funds of many investors.  Craven keeps his work highly secretive, so no one knows what's happening in his lab.  What is he working on that he'll go to great lengths to keep top-secret?