Danny goes to the museum where his wish comes true - afriendly dinosaur comes to life and spends the day playing withhim. As the dinosaur says, after one hundred million years, it'sgood to play outside! The two have a monstrously good time eatingice cream, going to a ball game, and playing hide-and-seek withDanny's friends. When the day comes to an end, the dinosaur mustreturn to the museum, even though Danny wants to keep him as a pet.After all, the museum needs him, and, Danny realizes, the dinosaurprobably wouldn't fit in his house!