The last episode of a TV show or movie in a franchise is supposed to provide closure, preferably with some sort of connection to the first episode or movie.
For example, the last episode of The Cosby Show is about Theo graduating from NYU, making the connection with the first episode, when Theo was contemplating dropping out of high school, the episode in which Bill Cosby uttered the famous line “I brought you into this world, and I’ll take you out [of it].”
The final shot of Toy Story 3 consists of a group of clouds moving across the sky in the same pattern as the wallpaper in the first shot of Toy Story.
The last episode of Seinfeld repeats the conversation about George’s button from the pilot.
C-3PO, who says the first line in A New Hope, says the last line in Revenge of the Sith, while onboard the same ship.
When done right, it’s often impressive; the creators show that they know just how to pull at the audience’s nostalgic heartstrings. But if it’s done wrong, it seems forced and just plain stupid. Some might use this all-too-common aspect to say that closure is overrated and not really necessary. But this argument, like many arguments, falls prey to the “it depends on the show/movie” defense.

