Back to the Jurassic tells the story of a daredevil kid named Ernie, his little sister Julia, and his best friend Max. While horsing around in Max's inventor father's workshop, they accidentally trip a time-machine into operation and find themselves transported back in time 65 million years.
Once in the past, they are adopted by a doting dinosaur mom named Tyra, portrayed by Melanie Griffith, and a rambunctious dinosaur "brother" named Dodger, played by Rob Schneider. The three kids explore the excitement of the prehistoric world, trying to steer clear of Tyra's evil dinosaur rivals, portrayed by William Baldwin and Stephen Baldwin.
Meanwhile, back in the present day, Max's dad and Ernie and Julia's overprotective mom, played by Jane Lynch, plot their rescue.