After a dare-devil kid named Erniehis sister Julia, along with also his best friend Max are horsing around in Max's inventor father's workshop, they accidentally trip a time machine to performance and are transported back in time 65 million decades, at which they meet a trex termed Tyra and her rambunctious dinosaur son Dodger. The improbable group wind up on an remarkable adventure exploring the lush prehistoric jungle, despite they being conspired against by the wicked dinosaur rivals of Tyra while, in today, Ernie and Max's daddy along with Julia mommy plot their rescue.