Blue, the great blue whale, is visited by three ghosts on Christmas Eve. The first ghost is the Ghost of Christmas Past, a huge and old prawn with a long white beard. He takes Blue on a journey through his childhood memories and shows him how he became the adventurous and determined whale he is today. The second ghost is the Ghost of Christmas Present, a young starfish. She shows Blue all the joy and happiness that his loved ones are experiencing on this special holiday. The third ghost is the Ghost of Christmas Yet to Come, a futuristic jellyfish. She shows Blue a possible future where he has become selfish and greedy, causing him to lose all of his friends and happiness. Through these visits, Blue learns the true meaning of Christmas and the importance of being kind and generous to others. He realizes that he has the power to choose his own path and to be the kind and selfless whale that he wants to be.