prequel

剑桥词典

a film , book , or play that develops the story of an earlier film , etc. by telling you what happened before the events in the first film , etc.
（據已問世文藝作品的情節憑想象上溯創作的）先行篇，上篇，前傳
Jean Rhys's novel "Wide Sargasso Sea" is a prequel to Charlotte Bronte's "Jane Eyre". 瓊•裡斯的小說《藻海無邊》是夏洛蒂•勃朗特的《簡•愛》的前篇。
比較
sequel 返回 prequel