You may have heard people refer to film and TV adaptations as “canon,” which means the story follows the source material or is true to the book it was originally based on. But in Across The Spider-Verse, the latest Spider-Man comic action film, we’re introduced to the concept of canon events. In the multiverse (which is basically the collective term for alternate dimensions and multiple timelines that all exist at the same time), a canon event is a character-defining moment that has to happen to every version of you, in every universe.