As of 2026, the Demon roller coaster is 50 years old. It originally opened in 1976 at both Marriott's Great America parks (now Six Flags Great America in Gurnee, Illinois, and California's Great America in Santa Clara). When it first launched, it was known as "Turn of the Century" and featured two back-to-back vertical loops. In 1980, the ride underwent a massive transformation to its current "Demon" theme; the park added two additional corkscrew inversions, a signature rock-cavern tunnel, and the iconic "blood-red" waterfall (which is often now just a mist effect). It was one of the first roller coasters in the world to feature four inversions. Despite its age, it remains a "cult classic" among coaster enthusiasts for its vintage Arrow Dynamics design and its catchy, albeit slightly dated, theme song that plays in the station. While newer, smoother coasters have since dominated the parks, the Demon stands as a historic landmark of the "Second Golden Age" of roller coasters, representing the transition into the high-inversion era of the late 70s and early 80s.