Luigi is a fictional character featured in video games and related media released by Nintendo. Created by prominent game designer Shigeru Miyamoto, Luigi is portrayed as the slightly younger but taller fraternal twin brother of Nintendo's mascot Mario, and appears in many games throughout the Mario franchise, often as a sidekick to his older brother.
The heroes of Earth all work together as Dr. Doom is trying to use a combination of tech and magic to travel to hell, absorb Mephisto's power along with several individuals' power notably Galactus to rule Earth under his rule.