The title for the most intense roller coaster at Walt Disney World is a toss-up between Guardians of the Galaxy: Cosmic Rewind and Rock 'n' Roller Coaster Starring Aerosmith. For sheer "G-force" and traditional thrills, Rock 'n' Roller Coaster at Hollywood Studios takes the lead because it is the only coaster on property that features inversions (it goes upside down three times) and a high-speed launch that hits 57 mph in 2.8 seconds. However, many modern riders consider Cosmic Rewind at EPCOT to be more intense in a different way. It is one of the world's longest fully enclosed coasters and features a reverse launch and "omnicoaster" vehicles that rotate 360 degrees while moving along the track. This rotation, combined with the massive digital screens and the high-speed drifting sensation, can be very disorienting and frequently causes motion sickness. If you prefer high-speed drops and high altitudes, Expedition Everest at Animal Kingdom is also a contender, notably for its large outdoor drop and a significant portion of the ride spent traveling backward in total darkness. Ultimately, for classic high-intensity thrills, Aerosmith wins; for modern, disorienting intensity, Guardians is the champion.