After becoming the zoo's most popular student ambassador, Ana Wright, twelve, is starting to love her life when Ashley, her archenemy from school, volunteers at the new aquarium, and Ana finds her life turned upside-down again.

Young penguins Jackson, also known as Secret Agent 00Zero, and his inventor-friend, Quigley, investigate who is stealing rare fish from the Rookeryville aquarium, hoping to prove themselves to the Frosty Bureau of Investigation.

While no cat can be called ordinary, Leonard is definitely no ordinary cat. In fact, he is an alien, sent on an earthly sabbatical and mistakenly given the body of a rather scruffy stray. Rescued by animal lover Olive, Leonard does his best to study the humans he hoped to join while contending with the indignities of hair balls, kitty litter, and a compulsion to shred the curtains. And as he collects experiences - shared cheese sandwiches, jokes,...

While on a field trip to the aquarium, Nancy discovers that she loves all the different sea life except for jellyfish, but with the help of Ms. Glass and her friends, Nancy is able to overcome her fear of the gelatinous animals.

"An octopus is taken from his undersea home to live in an aquarium, but he soon tires of captive life"--

When Biscuit takes himself to the aquarium, he sees fish of all different colors, sea turtles, large tanks of jellyfish, and even sea lions that bark just like him. Bark! Bark! Woof, woof!

When best friends Iris and Walter go on a field trip to an aquarium, Walter gets lost and a worried Iris helps Miss Cherry look for him.

Wednesday, a whale living in captivity, is inspired by a little girl named Piper to try to reach the sea.

Frankie was a completely normal pet goldfish until Tom's evil-scientist big brother Mark tried to murder him with toxic gunge. Luckily Tom and his best friend Pradeep shocked Frankie back to life with a battery, and he's been their zombie-fishy friend ever since. On a trip to the aquarium, something fishy starts going on. Something that almost certainly involves evil older brothers, a vampire kitten, a psychic octopus and a plot to take over the world....

Curious George jumps in with the seals during his visit to the aquarium and becomes the star attraction.