In popular culture and fiction, the phrase "Master of the Universe" is often associated with the fictional character He-Man, who is the protagonist of the Masters of the Universe franchise. He-Man is a superhero and the alter ego of Prince Adam, possessing superhuman strength and fighting against the villainous Skeletor to protect the realm of Eternia.
However, if you're referring to the philosophical or metaphysical notion of a "Master of the Universe," it typically does not refer to a specific individual or character. Instead, it is a metaphorical or rhetorical expression used to convey a sense of power, control, or dominance over one's environment or circumstances. It is often used to describe someone who wields significant influence or holds a position of great authority or mastery in a particular field or domain.
In reality, there is no singular "Master of the Universe" as the phrase is generally used as a metaphor rather than a literal title. Different people may hold power or expertise in various areas, such as science, technology, politics, or business, but no single individual can claim absolute mastery over all aspects of the universe.