A "prequel trilogy" refers to a series of movies or books that take place before a previously released story or series. It helps to provide the background, history, or origins of certain characters or events in the original story. Full definition
According to the rumour section in the latest issue of the US Official Xbox Magazine, People Can Fly might be tasked with developing a Gears of War prequel trilogy. (nextgengamingblog.com)
While we did have an absolute humdinger of a film that was The Empire Strikes Back, we also had duds like pretty much the entire prequel trilogy. (indianexpress.com)
The «Star Wars» prequel trilogy told the story of a young Jedi who grows up to become Darth Vader, Lord of the Sith. (fortune.com)