Millions of years ago, dinosaurs on Earth became extinct when a comet devastated the planet. If that had not happened, what would the world have been like? In this movie about a young dinosaur and his father who go for a walk one day, an alternate reality where dinosaurs continue to thrive is explored.
A rainstorm begins as the father and son are headed home after their walk and disaster strikes as the river rages out of control. It overflows its banks and the young dinosaur is swept away with the current. This begins the story of his journey to find his family and return home.
On his search to find his family, the young dinosaur will make new friends and find dangers in the wider world he has never experienced before. He and his new friend will learn the meaning of family as they travel together.