Movie Multipack

Making multiple films together. Normally Hollywood waits until it knows it's got a hit before ordering up a sequel, but that approach has problems. If they're lucky, the original writers will have left Sequel Hooks, but the seams will still be visible, and they've got to get the original cast back together.

It's so much simpler to make the sequel before the first film is released. The stories can be written to fit together smoothly, and none of the cast are going to disappear, or demand more money.

Movie multipacks come in three varieties.

Two sequels for the price of one. Following a hit film with a two-pack of sequels, to complete the trilogy. Examples:

One story in N parts. When the story is too long to fit in just one part it can be split over several films, all but the last typically ending in a Cliffhanger. Examples:

String of stories. Particularly with book adaptations, the story may naturally come as a multi-volume epic. Each individual film has closure, not a cliffhanger, but together they form a greater whole. As of late, adaptations have also been subjected to the above One story in N parts phenomenon by splitting the final book into two films, essentially doubling down on this trope. Examples:

All the varieties are often sold as Boxed Sets.