Medusa, Steel roller coaster at Six Flags Discovery Kingdom, California, US

Medusa is a steel floorless roller coaster built by Bolliger & Mabillard at Six Flags Discovery Kingdom in Vallejo, California. Its 3,937-foot (1,200 m) track reaches 150 feet (46 m) at the lift hill and again on the drop, which descends into a below-ground trench. Riders pass through seven inversions, among them a 128-foot (39 m) vertical loop and the first sea serpent roll on a B&M coaster.

Medusa opened in 2000 as the first floorless coaster on America's West Coast. This innovative system changed how theme parks designed thrill rides in the region.

Medusa's name comes from the Gorgon of Greek myth, fitting a ride whose sea serpent roll coils like a snake. Its opening on March 18, 2000 drew crowds to what was then Six Flags Marine World, and the $15 million ride became a signature attraction. Three trains of eight cars each seat four riders per row, held by shoulder restraints.

Riders should know the coaster moves quickly through its course and restraints keep passengers secure throughout. It's wise to secure loose items and pay attention to crew instructions before boarding.

Medusa's track runs 3,937 feet, making it the longest coaster in Northern California. Its 128-foot vertical loop ranks among the largest in the world, and the lift hill and drop both measure 150 feet, a height shared with The Flash: Vertical Velocity and Superman: Ultimate Flight in the same park.