The show revolves around the adventures of Denver, the last dinosaur – a Corythosaurus – who was released from his egg by a group of multicultural modern California teens: Jeremy, Mario, Shades, Wally, and Casey, along with tag-along older sister, Heather. The kids taught Denver the finer points of skateboarding and other pastimes while protecting him from rock concert promoter Morton Fizzback who wanted to use the dinosaur to make money.
The series begins when Jeremy, while preparing for his Natural History test, and his friends visit the La Brea Tar Pits – A place in Los Angeles (which is spread over a large area and contains a large collection of extinct animal and plant fossils) and go to the Museum. At the museum, the friends encounter a gang of bullies. The friends escape the bullies by hiding behind a fence near the tar pits. Behind the fence they find a pit that contains a large prehistoric egg. As the friends are playing with the egg it suddenly cracks and a green friendly dinosaur emerges who, inexplicably, understands English. The kids name him Denver after they spot an advertisement for the city of Denver on a passing bus.
The children decide to keep Denver and to keep his existence a secret. Denver is first hidden in a pool house at Wally’s home. After Wally’s sister discovers Denver they move Denver to the old school gym. After a while Denver gets kidnapped by the manager Morton Fizzback. Morton puts Denver on a stage in front of an audience in order to become rich.
When the children confront Morton about his abduction, he becomes paranoid that someone might find out that Denver is a real dinosaur. At the end, Denver is sold to a scientist named Professor Funt who wants to examine and experiment on him, and use him to become famous. Eventually, everything turns out fine and Denver gets to return to the gang and rescue them from Nick and his thugs.
In addition to his natural skills and abilities, Denver can also, with the help of a piece from the shell of his egg, take the gang with him back to the time whence he came.
