The phrase "origin movie" refers to a film that shows the background story of a character or a franchise. It explains how the character became who they are or how the franchise began. Full definition
That opening act is easy to criticize, but far preferable in my view to giving each of these characters their own origin movie. (dvdizzy.com)
I like origin movies, but the movie needs to get into the meat of the story and not stop short. (crunchonthis.com)
You know an idea is being mined for all its worth when the villains of literature and popular culture are getting their own origins movies. (independent.ie)