The narrative of Rick and Morty uses the Many-Worlds Interpretation of quantum physics to build its multiverse framework.

The show does not just use the multiverse as a cheap plot device. It builds a highly structured narrative world based on actual quantum theory. By using the Many-Worlds Interpretation, the writers create a setting where every choice and event splits reality into infinite parallel timelines. This allows the show to explore different versions of the same characters, showing how minor changes in environment or choice can completely alter a person's life path.