Their magic tree house takes Jack and Annie deep into the sea, where they meet up with dolphins, sharks, and octopi as they search for the answer to an ancient riddle.

As Pete the Cat searches underwater for a seahorse, he comes into contact with all manner of sea creatures.

While on a field trip to the farmers' market, Clark becomes separated from his classmates and must use his rhyming skills to help him remember his teacher's instructions.

Mr. Fish feels nervous venturing deep in the sea to look for Ms. Clam's lost pearl until Miss Shimmer helps him conquer his fear of the dark.

Kate the mermaid and her undersea friends try to help an electric eel recover his "zap."

When Clark's mom makes brownies for school, Clark cannot stop himself from eating the delicious treat.

Danny Dragonbreath and his friend Wendell get an up-close underwater tour of the Sargasso Sea from Danny's sea-serpent cousin, encountering giant squid and mako sharks--and learn about standing up to bullies in the process.

"Narwhal and Jelly learn a thing or two about tusk-tooth dental hygiene . . . and feelings! Everyone knows that Narwhal is a big fan of sugary treats--but Jelly is shocked when Narwhal's tusk-tooth isn't looking so pearly white anymore. Thankfully, no one knows more about dental hygiene than Shark--he has seven rows of teeth, after all! Meanwhile, Jelly and Crab try to teach Narwhal that it's fine to frown if you're feeling down. Can Narwhal's friends...

Inky's Great Escape follows a Houdini-esque octopus as he pulls his greatest disappearing act yet. Inky, worn out from his exciting life in the ocean, has retired to the aquarium. There he quietly regales his tankmate Blotchy with tales of his past adventures. Then Blotchy dares Inky to make one more daring escape: out of their tank ... and the aquarium. Will Inky succeed?

It's Saint Patrick's Day in the deep blue sea, but the gold that Pout-pout fish puts in his pot to complete his costume is missing. Can Pout-pout and his friends locate the gold in time to save the day?