Doraemon: Nobita's Great Adventure in the Antarctic Kachi Kochi

Unable to bear the summer heat, Doraemon takes Nobita and his friends to a huge iceberg floating in the South Pacific. While building an amusement park with the secret tool "Ice-Making Iron," the group discovers a mysterious golden ring in the ice. After a closer examination, they determine that the ring was buried in Antarctica 100,000 years ago, before people could live there. Doraemon and his friends head to Antarctica in search of the ring's owner and come across the ruins of a great city buried in the ice. Using Doraemon's Time Belt, the group travels back 100,000 years and meets young Kara, who is connected to the mysterious ring. But now the group must fight to survive while Doraemon faces the crisis of the entire Earth freezing over.