WARNING: This article contains MAJOR SPOILERS relating to
some of the most pivotal parts of Worm. Although all articles may contain spoilers, this article will reveal major plot twists and should almost certainly be avoided unless you have finished the story.
Sleeper is an S-Class threat. He is contained in the Mordovia Bubble in Russia.
↑"Wildbow: Sleeper was written in as a response to a fan saying that I shouldn’t go into detail and explain every character. He featured in a snippet I wrote back in the day (I spent ten years writing bits and pieces of superhero stuff before settling on the story I wanted to write) and seemed like a good one to drop in. He does have a power, but I think it’s best left unsaid, perhaps until the sequel." - Interview with Wildbow by t4nky