The removal of the Superman: Tower of Power at Six Flags St. Louis, which was officially confirmed around early 2021, was primarily due to a combination of aging hardware and high maintenance costs. Originally opening at Six Flags AstroWorld as Dungeon Drop in 1997 before being relocated to St. Louis in 2006, the Intamin-manufactured drop tower had reached the end of its serviceable lifespan. In late 2020, Six Flags announced a chain-wide initiative to retire approximately 15 older attractions that were plagued by frequent downtime and expensive upkeep. While the ride shared a name and manufacturer with the Kentucky Kingdom tower where a tragic cable accident occurred in 2007, the St. Louis removal was a business decision based on the ride's "mechanical reliability" rather than a specific safety incident. In its place, the park introduced the Catwoman Whip, a more modern and reliable thrill ride, as part of their ongoing efforts to refresh the park's lineup with newer technology that requires less daily maintenance.