High Quality Content by WIKIPEDIA articles! The Demon is a multi-looping roller coaster at Six Flags Great America in Gurnee, IL with an identical twin at California's Great America in Santa Clara, CA. Both coasters opened in 1976 as Turn of the Century and were heavily rethemed and renamed as The Demon in 1980. Turn of the Century opened with Marriott's Great America in 1976 and was designed by Arrow Development of Clearfield, Utah. It was painted white and was one of the first roller coasters to feature a double corkscrew. It also featured two airtime hills after the first drop. The hills were infamous for ejecting loose articles from the trains such as hats, sunglasses and stuffed animals. The ride was custom-built for both parks.