"Jaspers' Warp", also known as "Crooked World", was a Marvel UK storyline featuring primarily the character Captain Britain. It was originally published between 1981 and 1984 in Marvel Superheroes, #377–388, The Daredevils, #1–11 and The Mighty World of Marvel, volume 2, #7–13.

The story is notable for its creative participants. The story features Alan Davis's first work with the Captain Britain character. It also features the only mainstream Marvel Universe work by Alan Moore, who took over writing of the storyline one-third of the way through the saga (Marvel Super-Heroes #387) when David Thorpe (who began the storyline) abruptly left the series. It is also notable for officially designating the mainstream Marvel Universe with the label 616 and introduced many concepts regarding the Marvel Multiverse, such as the Captain Britain Corps and Saturnyne.

The Crooked World Storyline spun directly out of the events of the Black Knight strip in Hulk Weekly. After that story (called The Otherworld Saga) Captain Britain and his companion, the elf called Jackdaw, are dispatched by Merlyn back home to Captain Britain's Earth from the Otherworld, which is in another dimension.

During this journey through dimensions, Captain Britain's costume changes and Jackdaw gains a superhero costume, and he and Jackdaw find themselves on Earth. However, the pair found that this Earth is not quite as Captain Britain knew it.

They have various weird encounters, including fighting a monster made out of junk and a group of insane Alice in Wonderland-themed villains called The Crazy Gang and the mysterious Saturnyne and her henchmen, the Avant Guard.

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