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.

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.

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

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.

Shades develops a recent interest in karate. He is also very into Nikko, the daughter of his instructor.

Denver becomes a major radio star during a competition between KAY-HIP and KAY-LOUD radio stations.

When Heather and Wally's parents inform the two that they are expecting guests from out-of-town, they must hide Denver that the local movie theater, which is believed to be haunted.

A boy genius, Freddy Facknitts, invents a time machine that sends Denver and Morton Fizzback into the past and into the middle of a crazy caveman competition called Mammothball.

When the boys enter Wally's dog, Rocky, in a relay race for dogs, they also disguise Denver as a dog so that Rocky will perform well.

Denver and Mario take a job as children's entertainers only to incur the wrath of Douggie, the Dancing Clown, who tries to sabotage Denver and Mario's entertaining efforts.

On a visit to Aunt Shadie's ghost town, the kids and Denver go on a wild mining car ride while trying to retrieve the deed to the town from some thieves who had stolen it.

Denver falls in love with a mechanical dinosaur and follows her into the Big Deal Movie Studios. His friends must get him home without being discovered.

When disreputable treasure hunters kidnap a valuable dolphin from a marine research facility and use him to locate sunken treasure, Denver dives in to save the dolphin.

Heather and the boys take Denver to a mountain ski resort.

The secluded beach where Mario surfs and the kids play is taken over by Rad Tad and his group of Surf Dudes.

To help Wally in his predicament with Johnny Price, a practical joker who continually torments him, Denver uses his magic tar eggshell and shows Wally a time in his own life when he was tormented by the Pteranodon, and Wally is able to become friends with Johnny Price.

Decked out in caveman attire, Denver and the kids form a rock group (B.C. Rock) to compete in the city wide talent contest. Freddy Facknitts also form a group called Roborock (rock'n'roll robots). But Morton Fizzback and Dr. Funt steal the robot band right before the contest and the kids must go after them.

Denver, the boys, and Freddy Facknitts attend a comic book convention, dressed as their favorite comic heroes

No one anticipates the trouble that arises when one of the charity items collected for the school auction turns out to be a silver scepter belonging to Bertha Bird and her two sons.

Wally's pretty, female pen pal from Sweden, Inga Svinga, is coming to visit

Disguised in a Chinese lion headdress and robe, Denver leads a mad chase for dognappers through Chinatown during the Chinese New Year Parade.

Denver is kidnapped and put in a secret private zoo of the wealthy collector of exotic animals, Madame Menagerie, who hopes to make millions by selling the dinosaur to the movies.

In an embellished story of Jack and The Bean Stalk, Denver buys some magic corn kernels from Morton Fizzback, plants them, then climbs the giant stalk to arrive at the castle of the giantess (Bertha Bird).

Denver's mistaken identity at a golf tournament sets Fizzback and Funt off on a high-tech cheating spree while the golf course groundskeeper tries to capture what he believes to be the Loch Ness Monster.

When Denver, Casey and Freddy Facknitts become accidentally airborne in a Freddy-designed hover craft, the city starts to buzz with rumors of UFO sightings!

Mario and Shades get jobs working for competing fast food restaurants, and it jeopardizes their friendship.

Denver is participating in an exercise program with the kids while trying to hide a mischievous baby gorilla.

At a medieval fair, Denver and the kids wind up in a wacky jousting tournament, pitted against Morton Fizzback's Black Night.

Morton Fizzback and Bertha Bird join forces to pursue Denver after the dino escapes from them in a hot air balloon.

Denver and the kids help Jeremy's Great Aunt Adelaide save a precious fossil dig from a land developer who's being backed by Dr. Funt.

Denver's new-found talent as a gourmet cook is challenged when Jeremy is left alone to cater a party for his new girlfriend.

The kids play hockey against Morton Fizzback's team of professional misfits-- and the winner gets Denver!

Casey makes friends with Louden, the shy, withdrawn, new kid in town who has a passion for dinosaurs.

While on a mapping expedition with Aunt Adelaide, Denver and the kids meet two bizarre alligator poachers and a love-sick alligator, who mistakes Denver for an alligator.

The boys accept an invitation from their friend Senor Santos to spend a relaxing week at a resort on the mythical island of Canatta.

Denver dreams he's battling evil aliens from Pluto in a 1950's style sci-fi flick.

Mario reads a story he's written to Denver and the other kids, and through their imaginations they are all transported into an Arabian adventure involving a magic cavern filled with treasure, a genie in a lamp and a flying carpet.

The kids and Denver get in trouble when they try to find a place to skateboard at California's colorful Venice Beach.

Denver is discovered by a TV reporter who plans on making the dinosaur front page news

When Shades' grandfather misdirects this year's Cinco de Mayo parade, the boys must save the festival.

Morton Fizzback and Professor Funt conspire to create a major snowstorm in Los Angeles.