Dino Discovery

In this two-part season finale, Dex and Kayla need help taking on prehistoric undersea creatures like the Colossal Squid, Megalodon, and Albertonectes while hunting for fossils in their time-bending submarine. It's clear who they should bring in but, when both Kayla and Saara suggest they call Dana, Dex doesn't want to. Saara realizes that Dex is feeling neglected by their paleontological superstar middle sister while she's away working on a finding of her own. Luckily, it's biggest sister to the rescue when she brings her siblings together for an epic submarine adventure where Dex realizes that scientists have to work together to make major discoveries.