Johnny uses an invention to breathe underwater, yet sharks and electric eels begin to walk on land and wreak havoc to the beach.

Johnny fills the house with some of Hugh's favorite things listed in his notebook. However, Johnny learns that the book was also full of Hugh's least favorite things (most of them scary.) To make matters worse, Lila's boss is coming over for dinner that night.

Johnny uses a gadget to travel into a movie, The Quickest and the Monkiest. But what happens when the gadget gets stuck and the movie has a bad ending?

Johnny accidentally shrinks himself and Dukey into a sub-atomic universe while shrinking his toys. Unexpectedly, its nature turns against him.

Eugene brings a living monster truck to the Test house, and it began to be enraged after Eugene kicked it because it didn't win Susan's heart. Now the truck wants to destroy the entire monster truck species. It's up to Johnny to figure out how to stop it.