When a daredevil kid named Ernie, his sister Julia, and his best friend Max are horsing around in Maxs inventor fathers workshop, they accidentally trip a time-machine into operation and find themselves transported back in time 65 million years, where they meet a T-Rex named Tyra and her rambunctious dinosaur son Dodger. The unlikely group find themselves on an amazing adventure exploring the lush prehistoric jungle, despite Tyras evil dinosaur rivals conspiring against them – while, back in the present day, Maxs dad and Ernie and Julias overprotective mom plot their rescue.