The multiverse, the idea of different universes that exist at the same time, has been a plot device on screen and in comic books for years. The success of the recently released Deadpool & Wolverine, which has already earned US$1 billion (£778,180,000) at the box office, and the excitement around Iron Man actor Robert Downey Jr’s imminent return to the Marvel Cinematic Universe (MCU) – this time as villainous Doctor Doom – show the phenomenon is unlikely to go away anytime soon.
You could track it back to Sliding Doors (1998), which cut back and forth between two different realities, showing the ways a woman’s life diverged due to happenstance. Or you could go further still, with It’s a Wonderful Life (1946) which showed a different, darker, reality if James Stewart’s character, George, had died in childhood. Or even Dickens’ A Christmas Carol, where the Ghost of Christmas Yet To Come shows Scrooge an alternate, bleaker reality where he doesn’t change his ways.
On TV, an episode of The Twilight Zone first dealt with parallel worlds in 1963 – while, in a 1967 episode of Star Trek, Leonard Nimoy played an evil version of Spock from an alternate reality, signified mainly by his facial hair.
