When Calvin gets a school assignment to do some original research, he decides to investigate his dog's stinky breath and ends up learning about more than just smells.

Scooby-Doo and his friends from Mystery, Inc. must track down a monster so that a surfing contest in Hawaii in not ruined.

Calvin tries to earn money to buy Stella, the babysitter, a present for her sixteenth birthday because he feels guilty for taking advantage of her allergy to cats.

When millions of fish start dying off the coast of Hawaii and something is destroying hundreds of ships, the government enlists the Flock--a band of genetically modified children who can fly--to help get to the bottom of the disaster before it is too late.

Fourth-grader Cal learns a lot about teasing and standing up for others when a weird new student joins his class, while Stella, the tenth-grader who lives with Cal's family to help his mother, practices for her driving test.