Kings Island's only indoor roller coaster, Flight of Fear fires riders off for a dark, disorienting trip through an alien-themed abyss. Complete with more loops, twists and corkscrews than you can count, it's easily among the park's best bets for thrill seekers.

As of 2026, the primary "alien" or supernatural themed experience at Kings Island is the newly opened Phantom Theater: Opening Nightmare. While not strictly about "outer space" aliens, this interactive dark ride is the major 2026 addition that replaces the old Boo Blasters on Boo Hill. It features "enchanted opera boxes" where guests use special flashlights to capture escaped "ghost notes" and interact with a cast of eccentric, otherworldly characters like "No Legs Larry" and the "Maestro." If you are looking for a more traditional "sci-fi" or alien feel, the Area 72 section of the park—home to the world-record-breaking giga coaster Orion—features a heavy research-facility theme centered on extraterrestrial study and high-speed flight testing. While the park does not currently have a "little green men" style alien ride, the combination of the high-tech Orion and the whimsical, ghostly chaos of the new Phantom Theater provides the "out-of-this-world" adventure that fans of the paranormal and sci-fi genres crave.