Superman: Krypton Coaster, Steel roller coaster at Six Flags Fiesta Texas, San Antonio, United States.

Superman: Krypton Coaster is a steel floorless roller coaster at Six Flags Fiesta Texas in San Antonio, Texas. Built by Bolliger & Mabillard, it opened on March 11, 2000, with a 168-foot (51 m) lift hill, a 145-foot (44 m) vertical loop, and a top speed of 70 mph (110 km/h). Its red-and-blue tubular track runs along a quarry wall.

The ride was engineered by Bolliger & Mabillard and opened in 2000. It held the record for the world's tallest vertical loop at approximately 44 meters until another attraction claimed the title in 2013.

The ride is themed to Superman, and since 2016 riders can wear a Samsung Gear VR headset powered by Oculus for a 360-degree 3D experience: the story casts them as Superman saving a city from Lex Luthor's Lex Bots, who cause chaos with an anti-gravity ray. The floorless trains leave legs dangling above the track, and the station floor retracts for boarding.

The station has a retractable floor that retracts before dispatch, so riders step down into the open-air trains and stand on nothing. Each of the three trains seats 32 riders in eight rows of four, with over-the-shoulder restraints. The lift hill and the helix after the vertical loop both run along the top of a quarry cliff.

The lift hill's crest and the helix after the vertical loop both extend over a quarry cliff, so the train climbs and turns above the rock face. General manager John Odum said the closeness to the wall gives "a good sense of speed". The 145-foot loop made it the world's tallest when it opened on March 11, 2000.