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? (The Livyatan is a brand new Dino Dana creature for the new season).

Originally released by Sinking Ship Entertainment, Inc., 2016. Streaming video file encoded with permission for digital streaming by Infobase on March 31, 2021.