Without warning, millions of mysterious alien "doors" suddenly appear around the globe. In a rush to determine the reason for their arrival, mankind must work together to understand the purpose of these cosmic anomalies. Bizarre incidences occurring around the sentient doors leads humanity to question their own existence and an altered reality as they attempt to enter them. 不仅仅是怀旧，时尚唯美的画面，插入大量想象力丰富的新颖卡通，加上故事步步为营的铺垫，处处暗藏着微妙玄机，处处满载着神来之笔，处处诉说着“曾经沧海难为水”。