The late spring sun slanted across the La Brea Tar Pits as Wally, Jeremy, Shades, and Mario worked on their school project, carefully documenting the site's history. It was during this exploration that they unearthed something extraordinary…

Denver trailed after Jeremy to the supermarket, seeking refuge in the storeroom. There, he indulged in a surreptitious feast of potato chips, filling himself to capacity.

With a borrowed video camera from his sister Heather, Wally and a group of wide-eyed children embarked on a project: to create a video starring themselves.

A camping trip with his companions at a high-altitude lake takes an unexpected turn when Denver is mistaken for a monstrous creature of the depths.

In Denver, a connection forms between the children and the son of a circus proprietor. Together, they collaborate to inject excitement into the otherwise dull performances, incorporating daring bicycle and skateboard stunts.

A shared notion sparked among the boys: they would tackle a dinosaur project for the upcoming school science fair.

A wave of dismay washed over Wally and Heather as the news arrived: their parents were planning a move away. A sudden, unsettling panic seized them both.

Wally’s initial hours at the zoo quickly descend into misfortune when the ambitious Dr. Funt orchestrates the capture of Denver, intending to showcase the animal in his latest, cutting-edge exhibit.

Denver’s compassion unexpectedly extends to Scott, the boy’s most persistent rival. This act of kindness wins Denver's affection and effectively thwarts Scott’s scheme to publicize Denver negatively – a calculated move intended to generate …

During a visit to Jeremy’s Uncle Eli’s ranch in Nevada, Denver and the boys experience a local rodeo.

Lana Lake, Casey’s glamorous cousin with a career in film, extended an invitation: Casey, along with the boys and Denver, could come to the set of her newest science fiction picture, "Leapin' Lizards on the Loose."

Heather finds employment at a dinosaur-themed amusement park, where Denver wanders at liberty throughout the grounds, blending seamlessly with the staff adorned in dinosaur costumes.

Denver and Jeremy stepped onto the brightly lit stage of a bizarre game show, an unexpected adventure unfolding before them. Their competitors, it seemed, were the formidable duo of Morton Fizzback and the enigmatic Professor Funt.

A newfound fascination with karate has taken hold of Shades. He finds himself particularly drawn to Nikko, the instructor's daughter.

The city of Denver found itself unexpectedly thrust into the spotlight during a competitive battle between the city's two dominant radio stations, KAY-HIP and KAY-LOUD.

News arrived that their parents were hosting visitors from afar, and Heather and Wally found themselves with a delicate task: concealing Denver. The local cinema, whispered to be haunted, was strictly off-limits.

Freddy Facknitts, a boy of exceptional intellect, perfected a time machine. With a flash, he propelled himself and his companion, Morton Fizzback, into the distant past, depositing them squarely in the midst of a boisterous Mammothball comp…

As the boys prepared to enter Wally's dog, Rocky, in the canine relay race, they devised a plan. They would also disguise Denver as a dog, hoping to give Rocky a competitive edge.

Denver and Mario find themselves employed as children's entertainers, a venture that quickly draws the ire of Douggie, the Dancing Clown, who makes it his mission to undermine their performances.

During a visit to Aunt Shadie’s deserted settlement, the children and Denver embark on a spirited ride in a mining car, determined to recover the town's deed from a group of thieves who had made off with it.

A strange affection blossoms in Denver for a mechanical dinosaur, and he follows her into the bustling halls of Big Deal Movie Studios. His companions now face the task of returning him home, careful to avoid detection.

A band of unscrupulous treasure hunters abscond with a highly valued dolphin from a marine research center, intending to exploit the creature's abilities in the pursuit of lost riches. Drawn into the escalating crisis, Denver must intervene…

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

The quiet beach where Mario surfs and the children gather is now occupied by Rad Tad and his companions, the Surf Dudes.