Thunder Dolphin 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.
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. Thunder Dolphin's maximum speed is 130 kilometres per hour (81 mph).