In this two-part season opener, Dana, Saara and their Dad go on an undersea fantasy submarine adventure to figure out who was the apex predator of the prehistoric oceans -- the Megalodon or the Livyatan?

Dinoflies - Mom wants Dana to take a bath and Dana wants to study the Meganeura but can Dana do both? Winging It - Dad and Uncle Ravi get competitive trying to help Dana determine which prehistoric creature was the fastest.

Flying Expectations - Dana makes a new friend at the museum named Logan who believes that the Quetzalcoatlus couldn't fly but Dana thinks otherwise. Dino Talents - Dana tries to help a Baby Spinosaurus learn to hunt.

Danceasaurus - Riley has trouble fitting into Coach Powers' after-school dance program until Dana helps her out with a few tips she learns from observing an Incisivosaurus’s. Dino Memories - Dana uses egg-opening techniques from a clever Baby Troodon to try to get Mom's old chest open.

Dino In The Nest - When her new baby brother Dexter gets in the way of her dino experiment, Dana wishes he was a dinosaur - and gets her wish! Follow The Mammoth - When Dana visits Grandma's horse farm, she discovers a Mammoth herd that appears to only have females

Dino Feeder - When Dana tries to attract a squirrel to do Dino Experiment 8-1-8: "Which dinosaurs hunt small mammals?", she inadvertently injures a pigeon! Tyrannosaur Test - Dana finds a T-Rex, Albertosaurus and Nanuqsaurus outside and wants to do Dino Experiment 8-0-8, which Tyrannosaur was the best hunter?

Tail Power - While Saara and Olivia race toboggans, Dana uses her own T-Rex-ified toboggan to test which dinosaur had the strongest tail. Brontotherium And The Beast - Dana tries to help the Uncle Ravi by observing how a Male Brontotherium attracts a Female and then suggesting to Uncle Ravi to use the same wooing techniques.

Dino Deep Freeze - When the furnace gets broken, Dana investigates the different ways the Nanuqsaurus, Dromaeosaurus and Incisivosaurus stay warm. Dino Garden - When Dana visits Ms. Currie at the Botanical Gardens, she accidentally lets the Europasaurus, Dracorex and Hippodraco inside.

Problem Cub - Dana comes across a Baby Smilodon and tries to encourage her uncle and his girlfriend to adopt the Mom and Dad Smilodon’s parenting style. Dino Doodies - When Dana finds some unidentified dinosaur poop outside Grandma's barn, she's worried it belongs to a predator who is after Grandma's animals.

Prehistoric Hospital - Grandma is in the hospital with a hurt knee and Dana wants to help. Bugasaurus- Dad is trying to have a nap but a fly is in the apartment and driving him crazy. Dana investigates dino insect hunting techniques to help her Dad get the fly.

Dinosauroid - When Dana and Saara discover how Troodon could have evolved to become a human-like dinosaur called a “Dinosauroid”, the two sisters imagine a series of competitions to determine who was better: Humanoid or Dinosauroid. Dino Dana Says - While visiting the vet office where her Mom works, Dana investigates the possibility that dinosaurs mimicked each other, like some modern birds do.

Lovey Dovey Dino - When Uncle Ravi and Anjali move in together, it's clear that Anjali has a lot on her mind and Dana uses this opportunity to explore how Therizinosaurus get together with their mates. Best Nest - When Dana and Mom come home with a new crib for Dexter, some of the pieces get stolen by a Compsognathus, Microraptor and Archaeopteryx.

When Saara is worried that she's going to fail a science test on dinosaur names, Dana helps her learn the names through the power of song.