The Goosebumps book where ocean life grows gigantic, and direct sequel for Deep Trouble.
After last year's frightening adventure, Billy and Sheena Deep are spending another summer with their uncle in the Caribbean. This time, Dr. D is studying the fish in the area, which have strangely begun to grow to much larger sizes. The trio soon meet the scientist behind this, who will do anything to keep his work a secret...
It was adapted into the seventh and eighth episodes of the fourth season of the 1995 TV series, albeit under the title Deep Trouble.
The book provides examples of:
- Actionized Sequel: While the first Deep Trouble was an adventure story, the action was mostly in the last act. This features more action and peril throughout the whole story.
- Actually Pretty Funny: When again promising to Dr. Ritter that she and her family wouldn't tell anyone about his plankton, Sheena does the whole "cross my heart and hope to die" routine like a Girl Scout. Dr. Ritter laughs and tells her she's very amusing.
- Alliterative Name: One of Dr. Ritter's henchman is named Mel Mason.
- And Another Thing...: Dr. Ritter and his henchmen are on a dinghy and see Dr. D's boat tilting dangerously in the water, and came by to investigate. After boarding their boat, they meet Dr. D, and he assures him that everything is fine. Dr. Ritter and his men begin to go down the ladder to their tied up boat, but Dr. Ritter stops to ask the Deep family if they've seen anything strange in the waters lately. Unfortunately, Billy takes that chance to tell him the truth, which was a big mistake.
- Angry Fist-Shake: Dr. Ritter does this gesture as the Deep family are escaping.
- Artistic License – Biology: One of the covers depicts the giant seagulls from the book with eagle-like talons, instead of the duck-like feet real seagulls have. This may be part of their mutation, but the book never says so.
- Asshole Victim: Dr. Ritter. After trying to force it and its effects on Billy, he ends up drinking his own plankton, and turns into a fish.
- "Be Quiet!" Nudge: Dr. D does this twice to Billy when he keeps talking about the giant animals to Dr. Ritter. Both times, he fails to understand why he's doing this to him. Unfortunately, he realizes too late, that this gives Dr. Ritter enough information to understand that He Knows Too Much.
- Big "NO!": Billy lets out two in a row when an enormous shark slams into the boat he and Sheena are on.
- Big "SHUT UP!": Dr. Ritter snaps and yells "Quiet!" at Sheena when she complains.
- Covered in Gunge: Dr. D gets trapped under an enlarged snail that ate the special plankton, and he almost gets suffocated under there. Billy and Sheena manage to slide the big snail off of him, to which they find Dr. D covered from head to toe with sticky white goop from the snail's underbelly.
- Deserted Island: The heroes end up stranded on one towards the end.
- Facepalm: Billy buries his face in his hands when the giant snail burst out of the boat cabin in front of Dr. Ritter, proving that they indeed know about his experiments. Which leads to...
- Fascinating Eyebrow: Dr. Ritter's response upon seeing the giant snail.
- Forced Transformation: The size-changing plankton turns humans into fish for some reason. Was it made with Monster Blood or something?
- Friendly, Playful Dolphin: A pair of dolphins get beached on the deserted island. When the heroes rescue them, they return the favor by taking them back to the boat.
- Giant Enemy Crab: Billy and Sheena come across a crab as big as a table while on the desrted island. They and Dr. D are chased by it and barely climb up a palm tree to escape its' clamping claws, and stay up there for hours.
- Giant Flyer: Some seagulls eat the size-changing plankton and grow to giant size. They attack Dr. Ritter's boat, which gives the Deep's a chance to escape on the lifeboat.
- Harpoon Gun: Mel grabs one of these to use on the Deep's as they are escaping, and he almost hits Dr. D, but it very nearly misses him. As they board the lifeboat, Dr. Ritter grabs the gun himself and tries to shoot them, but a gull's large wing bumped his arm, knocking the gun into the water.
- Lame Comeback: When Sheena gets annoyed at Billy with his imagination, she calls him a moron. He replies "I'll show you."
- Mad Scientist: Dr. Ritter, who's been injecting growth hormones into the plankton beds, which cause anything that eats the plankton to grow huge. Or makes humans turn into fish.
- Man Bites Man: Adam and Mel are tying the Deep family with ropes. In resistance, Billy bites Adam's arm. This causes him to complain about it, to which Mel replies to bite him back.
- Mirthless Laughter: The Deep family have this after complaining how awful they feel while in the lifeboat alone at sea.
- Negative Continuity: In the ending of Deep Trouble, Billy is attacked by a sea monster. In Deep Trouble II he's alive and well with no mention of what happened in the previous book.
- Poisoned Chalice Switcheroo: In the end, when Dr. Ritter orders Billy to drink some of the plankton, Billy opts for a glass containing iced tea which he has prepared earlier in order to prank Sheena. Sheena had actually done the same thing, and quaffs hers at the end of the book, then worries she might have chosen the wrong bottle.
- Shark Fin of Doom: Billy tries to prank Sheena like this, but then a real shark comes along.
- Sinister Schnoz: The other henchman of Dr. Ritter, Adam Brown, has a "beaky" nose.
- Stop, or I Will Shoot!: Dr. Ritter says this to the Deep family as they escape from him with his lifeboat.
- Tears of Fear: Sheena has this when Dr. Ritter confronts her and the Deep's yet again.
- Tempting Fate: The Deep's end up on a lifeboat at sea with no food and waves pounding them. Billy says aloud that it can't get any worse than this, right? But then lightning appeared, thunder boomed, and then heavy rain poured down on them.
- Threatening Shark: Like in the last book, Billy gets attacked by a shark, but it's not especially relevant to the plot.
- Tickle Torture: At the beginning of the book, Billy pretends that Sheena is a giant octopus that is attacking him, and he proceeds to tickle her. She finds this very annoying.
- What Happened to the Mouse?: When the Deep family get back on their boat, they find Dr. Ritter there, but neither Mel nor Adam are with him. When they ask him what happened to them, he replies that's none of their business. Later, he admits that he tested his plankton on Mel last night, which turned him into a fish. He never reveals what happened to Mel.
- When It Rains, It Pours: Heavy sheets of cold rain instantly pour on the Deep family as they're in a lifeboat, filling it with water. They spend the rest of the night scooping water out, even using their sneakers to get it out.
