A massive ice floe carries an unexpected passenger across frozen oceans toward a bustling modern city. Dooly is a baby dinosaur who was once abducted by aliens, studied, and given superpowers before being sent back to Earth just as the Ice Age began. Cut off from his family, he spent that entire era sealed in ice, frozen yet still alive. Some ten million years later his glacier breaks away and drifts all the way to Seoul's Han River. There a girl named Younghee finds him, takes him for a stuffed toy, and brings him home to show her brother Chulsoo and their father Gildong, only for the thawed Dooly to wake up and say hello.