During the U.S. presidential election of 1988, a teen named Donnie sleepwalks out of his house one night and sees a giant, demonic-looking rabbit named Frank who tells him the world will end in 28 days, 6 hours, 42 minutes and 12 seconds. He returns home the next morning to find that a jet engine has crashed through his bedroom. As he tries to figure out why he survived and tries to deal with people in his town, Frank continues to turn up in Donnie's mind, causing him to commit acts of vandalism and worse.