: While attending a wedding in Palm Springs, Nyles—who has already been stuck in a loop for a long time—meets Sarah, the bride's sister and "black sheep" of the family. After following Nyles into a mysterious desert cave, Sarah also becomes trapped in the loop, forcing them to relive the same wedding day over and over. The two eventually develop a deep bond while navigating the existential dread and absurdity of their situation.

: A carefree guest who has spent countless "days" in the loop and has mostly given up on returning to the real world.

: Another wedding guest accidentally trapped in the loop by Nyles. He spends much of his time hunting and torturing Nyles in revenge.

: The reluctant maid of honor who initially struggles with the loop but eventually becomes the driving force behind finding a way out.