Nobita, who visited the dinosaur exhibition with his friends, and in a fossil excavation experience vows to his friends that he will discover a dinosaur and dares to eat peanuts with his eyes if he does not fulfill the dare. As he left the excavation experience he trips over a rock, and suspects he has found a fossil egg. He goes home and convinces Doraemon to use "time wrapping cloth" on the fossil egg and twin dino...