Thunder Run, Steel roller coaster in Canada's Wonderland, Ontario

Thunder Run is a powered steel roller coaster inside Wonder Mountain at Canada's Wonderland in Vaughan, Ontario. Its train of nine two-row cars plus a single front row climbs a banked left turn and an upward helix, part of it open to the outside, then drops through a double helix in darkness past strobe lights and a decorated light tunnel.

This coaster opened in 1981 as Blauer Enzian before being renamed Thunder Run and integrated into Wonder Mountain in 1986. That reconstruction transformed it into both an indoor and outdoor experience.

The runaway mine train theme is carried by props and effects inside Wonder Mountain, notably a dragon that Wonderland staff call "Herman". The same track is renamed Haunted Thunder Run during the park's October Halloween Haunt, when light, sound and fog effects are added.

The train has nine two-row cars plus a single front row, and the ride is programmed to run two circuits per departure. The height restriction of 102 centimetres (40 in) is set low enough for small children, so the coaster is aimed at families. Most of the layout runs in darkness inside Wonder Mountain.

This coaster uses an electric motor to power the trains instead of the traditional chain lift system. This allows each run to complete two full circuits.