Three curious kids, Ernie, Julia, and Max, accidentally activate a mysterious time machine in their father's lab, which transports them back 65 million years to the age of dinosaurs. Upon arrival, they befriend a maternal dinosaur named Tyra and her hyperactive son Dodger. Navigating this strange, prehistoric world, they encounter various perils and dinosaurs while trying to figure out how to return home. The children's resourcefulness and teamwork are put to the test as they work together to adapt to their new environment.

Meanwhile, the children's disappearance causes turmoil back home, prompting their frantic father to search for them using all available technology. As he closes in on their location, the kids learn valuable lessons about friendship, courage, and responsibility. Their thrilling journey through the lush landscapes and encounters with both friend and foe reshape their perspective on life and family as their adventure reaches its climax.