Thunder Dolphin (サンダードルフィン?) is a steel roller coaster at the Tokyo Dome City Attractions amusement park, which is part of Tokyo Dome City in Tokyo, Japan. The ride was designed and constructed by Intamin. At 262 feet (80 m) tall, Thunder Dolphin is currently the 6th tallest continuous circuit roller coaster in the World, behind Kingda Ka, Top Thrill Dragster, Steel Dragon 2000, Millennium Force, and Intimidator 305.
Following an incident in which a 25 cm long bolt fell from the ride while in motion on 5 December 2010, injuring a 9-year-old visitor, operation of the ride was suspended until 1 August 2013, when the ride reopened.Thunder Dolphin's 3,500 feet (1,100 m) long course passes through both a hole in the LaQua building, and through the Big-O, the world's first centerless Ferris wheel. The Thunder Dolphin has a maximum speed of 130 kilometres per hour (81 mph).
Designer: Werner Stengel
Model: Mega Coaster
Lift/launch system: Cable lift hill
Height: 262 ft (80 m)
Drop: 218 ft (66 m)
Length: 3,500 ft (1,100 m)
Speed: 80.8 mph (130.0 km/h)
Max vertical angle: 80°
Capacity: 1660 riders per hour
Height restriction: 4 ft 3 in (130 cm)