For a sequel to The Super Mario Bros. Movie, the mind races with possibilities. The franchise is more than forty years old at this point and has an exotic, distinct variety of installments. Mario has gone into space, been on holiday to a beach resort, and traveled the world with a body-snatching hat. However, a solid sequel can't simply give audiences an all-you-can-eat buffet of different ideas and concepts carved out of its many titles. Luckily, a smaller spin-off series from the games presents an obvious next step for the so-called Mario Cinematic Universe, and Luigi would be front and center as the main protagonist.