It is late Spring when Wally, Jeremy, Shades and Mario are at the La Brea Tar Pits working on a school research project and discover a mysterious tar egg that cracks open to reveal a friendly dinosaur.

Denver follows Jeremy to his job at the supermarket, where he hides in the storeroom and stuffs himself full of potato chips.

Wally borrows his sister Heather's video camera and the starry-eyed kids set out to make a video starring themselves.

While camping at a mountain lake with the boys, Denver is mistaken for a horrible lake monster.

The boys decide to do a science project on dinosaurs for the school science fair.

Denver and the kids make friends with a circus owner's son and help him liven up a lackluster show with bicycle and skateboard stunts.

Wally and Heather panic when they hear their parents are planning an out- of-town move.

Wally's first day on the job at the zoo takes a turn for the worse when the self-serving Dr. Funt captures Denver for his new high-tech exhibit.

The kind-hearted Denver rescues one of the boy's arch rivals, Scott, winning his heart and killing his plans to expose Denver to the media in order to gain publicity and votes for the upcoming student election.

While visiting Jeremy's Uncle Eli on his Nevada ranch, Denver and the boys attend a local rodeo.

Casey's movie-star cousin, Lana Lake, invites Casey, the boys and Denver to watch the filming of her latest sci-fi movie, "Leapin' Lizards on the Loose".

When Heather gets a job at a Dinosaur theme amusement park, Denver roams freely around the park and fits right in with all the dino-costumed employees.

Denver and Jeremy enter a wacky game show only to find they're competing against the team Morton Fizzback and Professor Funt.