Doctor Strange is a key piece in the Marvel Cinematic Universe puzzle largely because of the way it puts magic front and center in what has been a predominantly sci-fi fictional world -- but not to be ignored is the significance of another concept that may eventually prove incredibly important to the future of the franchise: the multiverse. A part of both Marvel and DC Comics for years, the theory is introduced to the titular hero by The Ancient One right alongside the ways of being a sorcerer, and it's established that it's both a major part of his powers and his future. That being said, it's also not exactly the easiest or simplest idea to wrap your mind around -- which is why I'm going to try and explain exactly how it all works for those of you who may be a bit confused after seeing the latest Marvel blockbuster.