Why is every game franchise a trilogy? For one reason or another, major video game franchises almost always tell their story over the course of three games. Halo, Mass Effect, and Dead Space are three franchises that come to mind, but there are countless others. While many of these games and franchises tell excellent stories within a trilogy, there are others that take it a step too far in trying to force a trilogy to make sure that they can meet that magical number of three.