A lonely penguin spends his monotone days alone in his habitat until he finds a mystery egg that he decides to nurse and care for. As he waits, the food on his tray is always finished, and at night he dreams of all the adventures he will have with his son once he comes out of his shell. The visitors, marveling at his dedication, prolong their stay. However, the days turn into months, and the penguin has grown old while he waits.