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Being an underwater adventure, it does have its scary moments.- The books cover art is quite frightening. A giant hammerhead shark swimming up towards an unsuspecting swimmer about to become its lunch.
- The Sea Monster that stalks Billy throughout the book. A giant monstrous octopus covered in seaweed like fur with strong tentacles, a maw full of sharp teeth, and one giant angry eye. It has almost nothing to do with the main plot and no explanation other than it wants to drag Billy down and eat him. And it pops up again at the very end right when the kid is going to bid goodbye to his new Mermaid friend. It seems to show that the ocean is very big, uncaring, and will still come for you even in your happiest moments.
Deep Trouble, Part 1:
- The two-part episode opens with Sheena fishing out on a small boat when a shark is heading toward her. Panicked, Sheena tries rowing to shore as fast as she can while the shark catches up to her. Thankfully the fright dies down as it is revealed that it was all a prank courtesy of her brother Billy.
- The entire time something is watching Billy and Sheena on the island from the bushes, making odd breathing noises.
- An intruder leaving green slime footprints all over the floors of the house where Billy and Sheena vacay, and the footprints morph from fish to human prints.
- In the basement, Billy and Sheena fight over a laboratory bottle of green slime and accidentally drop inside the tank of a blowfish. When they heard something break, they investigate the noise and find broken glass and the blowfish now tripled its size! With one breath, the blowfish causes its spikes to shoot off of its body, which break many things in the lab and nearly impale Billy and Sheena until their uncle and his partner come to help.
- The maid reprimands Billy and Sheena for eating the chocolate cake left in the kitchen. Only Billy and Sheena didn't touch the cake as they were outside the whole time. Who else could've gotten into the beach house?
- When Dr. Harold Deep, Billy and Sheena arrive at an island to investigate the strange occurrences, Ritter betrays them and leaves them behind on the island at the mercy of the experimental creatures running loose. Really the idea of being betrayed and you and your loved ones being left for dead by someone you thought was your friend.
- As the first part of the two part episode concludes, Harold, Billy and Sheena watch helplessly as Ritter leaves on his boat and something is once again lurking from the bushes watching them from behind... Cue the words "To Be Continued" in bright green and the end credits.
Deep Trouble, Part 2:
- When Harold, Billy and Sheena look around the island for something to help them leave safely or attract help, Billy gets separated from his family and gets kidnapped by something. His screams for help draw his uncle and sister to his location where they find more green smile and a watch that once belonged to Billy.
- Harold and Sheena try to find Billy only to run into some abnormally large creatures on the island, like a lizard and a beach crab now quadrupled in size and hunting after them for food.
- When hiding inside an empty cabin, Harold warns Sheena not to make any sudden noises or movements as even the slightest vibrations can draw the giant lizard to their location.
- Harold and Sheena hide in the cabin when two hands with large claws on them suddenly burst through the dirt beneath them and grabs Harold. Sheena tries to save her uncle Harold but he gets taken away by something prompting Sheena to come rescue both him and Billy.
- Sheena trying to locate her missing uncle and brother underground in the caves when she is spotted by a giant ant that attempts to eat her. Thankfully one of the mysterious Islanders comes to her aid and frightens off the giant ant with fire.
- Harold being blamed by the mutated fish experiment creatures for the green slime turning them into such things and attempt to kill him by tying him to a wooden post and leaving him to be eaten by a giant tarantula spider crawling toward him.
- Harold and Luis trying to explain to the other mutated fish experiment creatures that it really wasn't his fault and it was his partner Ritter who was to blame but they refuse to listen to him. If Billy, Sheena and Luis hadn't intervened and explained things to the creatures, Harold would've been killed.
- Ritter is preparing to leave with the laboratory research and make money when he spots some of the green slime left near the beach house and he takes off in a panic, screaming for whoever is after him to leave him alone. He makes it to his boat, only for his boat engine to not start up and a scale-y hand with claws on it touching his shoulder. Ritter gets surrounded by the mutated fish experiment creatures and is left screaming "No!" before the scene cuts to black. Though a scary scene, seeing Ritter get his just desserts by the same humans he tortured into becoming mutated fish experiment creatures is satisfying.
- The ending reveals Ritter's fate: as the maid of the beach house draws curious people to her little sideshow attraction, Ritter has been turned into one of the mutated fish creatures, with large gills covering all from his neck up to his face. And he is stuck that way.
