Four fun-loving dinosaurs take a trip to New York City, courtesy of Capt. Neweyes (Walter Cronkite). The time-traveling alien is intent on bringing some joy to the lives of the children of the Big Apple. After eating a potion to boost their smarts and cuddliness, Tyrannosaurus Rex (John Goodman), Triceratops Woog (Rene Le Vant), Pterodactyl Elsa (Felicity Kendal) and Hadrosaur Dweeb (Charles Fleischer) hit the town! But trouble soon arrives when Neweyes' evil brother hatches a devious plot.