pre·quel 
/ˈpri:kwəl/ noun
plural pre·quels /ˈpri:kwəl/ noun [count] : a movie, book, etc., that tells the part of a story that happened before the story in another movie, book, etc.
▪ His next film will be a prequel to last year's hit movie. — compare sequel
▪ His next film will be a prequel to last year's hit movie. — compare sequel
