Thunder Dolphin, Steel roller coaster at Tokyo Dome City, Japan

Thunder Dolphin is a steel roller coaster built by Intamin at Tokyo Dome City Attractions. Its 1,066.8-metre track climbs to 80.5 metres and drops at up to 74 degrees, passes through a hole in the LaQua building and through the centre of the Big-O, the world's first centreless Ferris wheel, reaching 130 km/h.

The coaster opened in 2003 as part of a project that transformed the former Korakuen Amusement Park into the modern Tokyo Dome City complex. This redevelopment brought a new entertainment destination to Tokyo's central location.

The ride's call is "Zero, ichi, ni, Thunder!", counted before each launch. Its sponsor is Art Hikkoshi Center, a moving company, and the name pairs thunder with the dolphin-like dips of the track. A skip pass sold separately lets riders pick a time with a shorter wait.

Most visitors can ride if they meet basic height requirements and fall within the typical age range allowed on the coaster. The location within Tokyo Dome City makes it easy to visit along with other attractions in the complex.

The 1,066.8-metre course passes through a hole cut in the LaQua building and threads through the centre of Big-O, the world's first centreless Ferris wheel. The lift is a winch rather than a roller chain, hauling trains up the 45.5-degree incline to the 80.5-metre summit in about 30 seconds.