Iron Wolf, the world's first stand-up roller coaster designed by Bolliger & Mabillard, was a staple of Six Flags Great America in Gurnee, Illinois, from 1990 until it was removed in September 2011. The ride was not scrapped, however; it was relocated to Six Flags America in Maryland, where it reopened in 2012 as a stand-up coaster named Apocalypse. In 2019, the ride underwent a major transformation: the stand-up trains were replaced with floorless sit-down trains, and the ride was re-themed as Firebird. In 2026, the track remains exactly the same as it was in the "Richie Rich" movie, but the "floorless" experience has made the ride much smoother and more accessible to modern thrill-seekers who found the original stand-up design too "rough." For fans of Great America, the spot once occupied by Iron Wolf now houses the record-breaking wooden coaster Goliath, which utilizes the same tight footprint to deliver one of the most intense ride experiences in the world, proving that even a classic legend can make way for something even bigger.