Doraemon - Season 1 Episode 86 Space Mountain Tai, The Forepart
Overview: Space Mountain Tai about prehistoric men and spacemen is Nobita's favorite show but he meets the star and finds it has gone over budget too much and is close to being canceled because of falling viewing figures. He decides to help him by going 150 million years into the past to get some real dinosaurs to replace the poor models they use in the show.