In Spider-Man: Across The Spider-Verse, Miles finds himself at odds with Miguel O'Hara, aka, Spider-Man 2099. At the end of the film he lands on Earth-42 by accident and finds himself face to face to with a variant of his who becomes the Prowler. And one fan theory suggests that O'Hara confronted The Prowler on Earth-42, and lost. Here's the theory in detail.