A shared universe is a modern movie marketing concept popularized by the overwhelming success of the Marvel Cinematic Universe from Marvel Studios. After the several false starts, DC Films decided upon a cinematic Multiverse of multiple different worlds rather than being bound by a single continuity like Marvel. Other studios have experimented in expanding non-superhero franchise with movies like Fast & Furious Presents: Hobbs & Shaw. Godzilla vs. Kong was a surprise hit, indicating that more spinoffs of WB's kaiju "Monsterverse" will be produced. Historians will point out that the Universal Monsters of the the 1940s and 50s innovated this concept long ago. A modern "Dark Universe" was attempted with Tom Cruise' Mummy reboot but it was abandoned after its failure at the box office. Another long standing example of the this started with Predator 2 at 20th Century Fox, crossing over with the Alien franchise at the end of the film, leading to Alien vs. Predator. The Multiverse concept was popularized by the success of Spider-Man: Into the Spider-Verse, eventually leading to Doctor Strange in the Multiverse of Madness and The Flash crossover with Michael Keaton's Batman.